Filed Pursuant to Rule 424(b)(3)
Registration File No.: 333-226435

To Our Stockholders:

As previously announced, on April 29, 2018, T-Mobile US, Inc. (which we refer to as “T-Mobile”) and Sprint Corporation (which we refer to as “Sprint”) entered into a business combination agreement (which, as it may be amended or supplemented from time to time, we refer to as the “business combination agreement”), pursuant to which T-Mobile and Sprint agreed to combine their respective businesses (which we refer to as the “merger transactions”). The combined company will be named “T-Mobile” and, as a result of the merger, is expected to be able to rapidly launch a broad and deep nationwide 5G network, accelerate innovation and increase competition in the U.S. wireless, video and broadband industries. Neither T-Mobile nor Sprint on its own could generate comparable benefits to consumers.

If the merger transactions are completed, each share of Sprint common stock (other than certain shares described in the business combination agreement) will be automatically converted into the right to receive 0.10256 shares (which we refer to as the “exchange ratio”) of T-Mobile common stock, the common stock of the combined company. We expect that the T-Mobile common stock will continue to be listed on the NASDAQ Global Select Market (which we refer to as “NASDAQ”) under the ticker symbol “TMUS.” Based on the closing price of a share of T-Mobile common stock on NASDAQ on April 27, 2018, the last trading day before public announcement of the merger transactions, the implied value of the exchange ratio to Sprint stockholders was approximately $6.62 per share. As of October 26, 2018, and assuming that each share of T-Mobile common stock will have a value equal to the closing price of a share of T-Mobile common stock on NASDAQ on such date, the implied value of the exchange ratio to Sprint stockholders is approximately $6.68 per share. Because T-Mobile’s share price will fluctuate between now and the completion of the merger transactions, and because the exchange ratio is fixed and will not be adjusted to reflect changes in T-Mobile’s or Sprint’s share price, the value of the T-Mobile common stock received by Sprint stockholders in the merger transactions may differ from the implied value based on the share price on the date of the business combination agreement or on October 26, 2018. We urge you to obtain current share price quotations for T-Mobile common stock and Sprint common stock.

Following the merger transactions, it is anticipated that Deutsche Telekom AG (which we refer to as “Deutsche Telekom”) and SoftBank Group Corp. (which we refer to as “SoftBank”) will hold, directly or indirectly, on a fully diluted basis, approximately 41.7% and 27.3%, respectively, of the outstanding T-Mobile common stock, with the remaining approximately 31.0% of the outstanding T-Mobile common stock held by other stockholders, based on closing share prices and certain other assumptions as of October 1, 2018. In connection with the closing of the merger transactions, Deutsche Telekom, SoftBank and T-Mobile will enter into an amended and restated stockholders’ agreement, and Deutsche Telekom and SoftBank will enter into a proxy, lock-up and ROFR agreement, each of which will provide for certain rights and restrictions in respect of the T-Mobile common stock that will be held by Deutsche Telekom and SoftBank from and after the closing of the merger transactions. Descriptions of these agreements can be found under the section of this joint consent solicitation statement/prospectus entitled “Stockholders’ and Proxy Agreements.”

The T-Mobile board of directors has carefully considered the terms of the business combination agreement and, following the determination by an independent committee of the T-Mobile board of directors that the merger transactions are fair to and in the best interests of all of T-Mobile’s stockholders (including such stockholders other than Deutsche Telekom) and the recommendation of the independent committee, has determined that the business combination agreement and the transactions contemplated thereby are fair to, and in the best interests of, T-Mobile and its stockholders. Accordingly, the T-Mobile board of directors has unanimously approved the business combination agreement and the transactions contemplated thereby. However, the approval of a proposal to amend and restate the T-Mobile certificate of incorporation, including three sub-proposals to (1) approve an increase in the number of authorized shares of T-Mobile common stock from one billion to two billion, (2) amend the director designation rights of Deutsche Telekom and add director designation rights of SoftBank and (3) add approval rights of SoftBank, in each case, including other amendments incidental or related to the foregoing (which we refer to, collectively, as the “T-Mobile charter amendment”) and the approval of the issuance of shares of T-Mobile common stock in the merger transactions (which we refer to as the “T-Mobile

share issuance” and, together with the T-Mobile charter amendment, the “T-Mobile proposals”) by holders of a majority of the outstanding shares of T-Mobile common stock (which we refer to as the “T-Mobile stockholder approval”) are required for the merger transactions to close.

T-Mobile is sending this document to its stockholders to request that they approve the T-Mobile proposals by executing and returning the written consent furnished with this joint consent solicitation statement/prospectus. The T-Mobile board of directors has set October 1, 2018 as the record date (which we refer to as the “T-Mobile record date”) for determining the holders of T-Mobile common stock entitled to execute and deliver written consents with respect to this solicitation.

Subsequent to the execution of the business combination agreement, Deutsche Telekom and Deutsche Telekom Holding B.V. (which we refer to as “Deutsche Telekom Holding”) entered into a support agreement (which we refer to as the “Deutsche Telekom support agreement”) under which they agreed, promptly (and in any event within two business days) following their receipt of this joint consent solicitation statement/prospectus, to execute and deliver a written consent with respect to all of the outstanding shares of T-Mobile common stock held by Deutsche Telekom Holding, representing approximately 63.5% of the outstanding shares of T-Mobile common stock as of the T-Mobile record date, approving the T-Mobile proposals (which we refer to as the “Deutsche Telekom written consent”). Because the T-Mobile proposals require the approval of at least a majority of the outstanding shares of T-Mobile common stock and Deutsche Telekom Holding is the beneficial holder of a majority of the outstanding shares of T-Mobile common stock as of the T-Mobile record date, the delivery of the Deutsche Telekom written consent will constitute receipt by T-Mobile of the T-Mobile stockholder approval.

The Sprint board of directors has carefully considered the terms of the business combination agreement and, following the determination by an independent committee of the Sprint board of directors that the merger transactions are fair to and in the best interests of all of Sprint’s stockholders (including such stockholders other than SoftBank) and the recommendation of the independent committee, has determined that the business combination agreement and the transactions contemplated thereby are fair to, and in the best interests of, Sprint and its stockholders. Accordingly, the Sprint board of directors has unanimously approved the business combination agreement and the transactions contemplated thereby. However, the approval of the adoption of the business combination agreement (which we refer to as the “Sprint merger approval”) by the holders of a majority of the outstanding shares of Sprint common stock is required for the merger transactions to close. In addition, Sprint is submitting to its stockholders a proposal for the approval (which, together with the Sprint merger approval, we refer to as the “Sprint stockholder approval”), on a nonbinding, advisory basis, of an amended and restated T-Mobile certificate of incorporation, including three sub-proposals to (1) approve an increase in the number of authorized shares of T-Mobile common stock from one billion to two billion, (2) amend the director designation rights of Deutsche Telekom and add director designation rights of SoftBank and (3) add approval rights of SoftBank, in each case, including other amendments incidental or related to the foregoing (which we refer to, collectively, as the “Sprint advisory T-Mobile charter amendment” and, together with the Sprint merger approval, the “Sprint proposals”).

Sprint is sending this document to its stockholders to request that they approve the Sprint proposals by executing and returning the written consent furnished with this joint consent solicitation statement/prospectus. The Sprint board of directors has set October 1, 2018 as the record date (which we refer to as the “Sprint record date”) for determining the holders of Sprint common stock entitled to execute and deliver written consents with respect to this solicitation.

Subsequent to the execution of the business combination agreement, SoftBank, SoftBank Group Capital Limited, Starburst I, Inc. (which we refer to as “Starburst”) and Galaxy Investment Holdings, Inc. (which we refer to as “Galaxy”) entered into a support agreement (which we refer to as the “SoftBank support agreement”) under which they agreed, promptly (and in any event within two business days) following their receipt of this joint consent solicitation statement/prospectus, to execute and deliver a written consent with respect to all of the outstanding shares of Sprint common stock held by Starburst and Galaxy, representing approximately 84.5% of the outstanding shares of Sprint common stock as of the Sprint record date, approving the Sprint proposals (which we refer to as the “SoftBank written consent”). Because the Sprint proposals require the approval of a

majority of the outstanding shares of Sprint common stock and Starburst and Galaxy are, collectively, the beneficial holders of a majority of the outstanding shares of Sprint common stock as of the Sprint record date, the delivery of the SoftBank written consent will constitute receipt by Sprint of the Sprint stockholder approval.

Neither T-Mobile nor Sprint will be holding a stockholders’ meeting to consider the T-Mobile proposals or the Sprint proposals, as applicable.

The obligations of the parties to the business combination agreement to complete the merger transactions are subject to the satisfaction or waiver of several conditions set forth in the business combination agreement, a copy of which is included as Annex A to the accompanying joint consent solicitation statement/prospectus. The accompanying joint consent solicitation statement/prospectus provides you with detailed information about the business combination agreement and the merger transactions. It also contains or references information about T-Mobile and Sprint and certain related matters. You are encouraged to read the accompanying joint consent solicitation statement/prospectus, including the Annexes and the documents incorporated by reference in the accompanying joint consent solicitation statement/prospectus, carefully and in their entirety. In particular, you should read the “Risk Factors” section beginning on page 40 of the accompanying joint consent solicitation statement/prospectus for a discussion of the risks you should consider in evaluating the proposed transactions and how they will affect you.

We look forward to the successful combination of T-Mobile and Sprint.

Neither the U.S. Securities and Exchange Commission nor any state securities commission has approved or disapproved of the merger transactions or the securities to be issued in connection with the merger transactions or passed upon the adequacy or accuracy of the disclosure in this document. Any representation to the contrary is a criminal offense.

The accompanying joint consent solicitation statement/prospectus is dated October 29, 2018, and is first being mailed to the stockholders of T-Mobile and Sprint on or about October 29, 2018.

T-MOBILE US, INC.

12920 SE 38th Street

Bellevue, Washington 98006-1350

NOTICE OF SOLICITATION OF WRITTEN CONSENT

To Stockholders of T-Mobile US, Inc.:

Pursuant to a Business Combination Agreement, dated as of April 29, 2018 (which we refer to as the “business combination agreement”), by and among T-Mobile US, Inc. (which we refer to as “T-Mobile”), Sprint Corporation (which we refer to as “Sprint”), Huron Merger Sub LLC, a wholly owned subsidiary of T-Mobile (which we refer to as “Merger Company”), Superior Merger Sub Corporation, a wholly owned subsidiary of Merger Company (which we refer to as “Merger Sub”), Starburst I, Inc. (which we refer to as “Starburst”), Galaxy Investment Holdings, Inc. (which, together with Starburst, we refer to as the “SoftBank US HoldCos”), and for the limited purposes set forth therein, Deutsche Telekom AG, Deutsche Telekom Holding B.V. and SoftBank Group Corp., the SoftBank US HoldCos will merge with and into Merger Company, with Merger Company continuing as the surviving entity and as a wholly owned subsidiary of T-Mobile, and Merger Sub will merge with and into Sprint, with Sprint continuing as the surviving corporation and as a wholly owned subsidiary of T-Mobile, in each case on the terms and subject to the satisfaction or waiver of the conditions described in the business combination agreement (which we refer to, collectively, as the “merger transactions”).

This joint consent solicitation statement/prospectus is being delivered to you on behalf of the T-Mobile board of directors to request that holders of T-Mobile common stock as of the record date of October 1, 2018 (which we refer to as the “T-Mobile record date”) execute and return written consents to approve the amendment and restatement of the T-Mobile certificate of incorporation in connection with the merger transactions, including three sub-proposals to (1) approve an increase in the number of authorized shares of T-Mobile common stock from one billion to two billion, (2) amend the director designation rights of Deutsche Telekom and add director designation rights of SoftBank and (3) add approval rights of SoftBank, in each case, including other amendments incidental or related to the foregoing (which we refer to as the “T-Mobile charter amendment”), and approve of the issuance of shares of T-Mobile common stock in the merger transactions (which we refer to as the “T-Mobile share issuance” and, together with the T-Mobile charter amendment, the “T-Mobile proposals”).

This joint consent solicitation statement/prospectus describes the merger transactions and the T-Mobile proposals and the actions to be taken in connection with the merger transactions and the T-Mobile proposals and provides additional information about the parties involved. Please give this information your careful attention. A copy of the business combination agreement is attached as Annex A to this joint consent solicitation statement/prospectus.

The T-Mobile board of directors has carefully considered the terms of the business combination agreement and, following the determination by an independent committee of the T-Mobile board of directors that the merger transactions are fair to and in the best interests of all of T-Mobile’s stockholders (including such stockholders other than Deutsche Telekom) and the recommendation of the independent committee, has determined that the business combination agreement and the transactions contemplated thereby are fair to, and in the best interests of, T-Mobile and its stockholders.

Please complete, date and sign the written consent furnished with this joint consent solicitation statement/prospectus and return it promptly to T-Mobile by one of the means described in “Solicitation of T-Mobile Written Consents.”

By Order of the Board of Directors,

Timotheus Höttges

Chairman of the Board of Directors

October 29, 2018

SPRINT CORPORATION

6200 Sprint Parkway

Overland Park, Kansas 66251

NOTICE OF SOLICITATION OF WRITTEN CONSENT

To Stockholders of Sprint Corporation:

Pursuant to a Business Combination Agreement, dated as of April 29, 2018 (which we refer to as the “business combination agreement”), by and among T-Mobile US, Inc. (which we refer to as “T-Mobile”), Sprint Corporation (which we refer to as “Sprint”), Huron Merger Sub LLC, a wholly owned subsidiary of T-Mobile (which we refer to as “Merger Company”), Superior Merger Sub Corporation, a wholly owned subsidiary of Merger Company (which we refer to as “Merger Sub”), Starburst I, Inc. (which we refer to as “Starburst”), Galaxy Investment Holdings, Inc. (which, together with Starburst, we refer to as the “SoftBank US HoldCos”), and for the limited purposes set forth therein, Deutsche Telekom AG, Deutsche Telekom Holding B.V. and SoftBank Group Corp., the SoftBank US HoldCos will merge with and into Merger Company, with Merger Company continuing as the surviving entity and as a wholly owned subsidiary of T-Mobile, and Merger Sub will merge with and into Sprint, with Sprint continuing as the surviving corporation and as a wholly owned subsidiary of T-Mobile, in each case on the terms and subject to the satisfaction or waiver of the conditions described in the business combination agreement (which we refer to, collectively, as the “merger transactions”).

This joint consent solicitation statement/prospectus is being delivered to you on behalf of the Sprint board of directors to request that holders of Sprint common stock as of the record date of October 1, 2018 (which we refer to as the “Sprint record date”) execute and return written consents to approve the adoption of the business combination agreement (which we refer to as the “Sprint merger approval”). You are also being requested to approve, on a nonbinding, advisory basis, the amendment and restatement of the T-Mobile certificate of incorporation in connection with the merger transactions, including three sub-proposals to (1) approve an increase in the number of authorized shares of T-Mobile common stock from one billion to two billion, (2) amend the director designation rights of Deutsche Telekom and add director designation rights of SoftBank and (3) add approval rights of SoftBank, in each case, including other amendments incidental or related to the foregoing (which we refer to, collectively, as the “Sprint advisory T-Mobile charter amendment” and, together with the Sprint merger approval, the “Sprint proposals”).

This joint consent solicitation statement/prospectus describes the merger transactions and the Sprint proposals and the actions to be taken in connection with the merger transactions and the Sprint proposals and provides additional information about the parties involved. Please give this information your careful attention. A copy of the business combination agreement is attached as Annex A to this joint consent solicitation statement/prospectus.

The Sprint board of directors has carefully considered the terms of the business combination agreement and, following the determination by an independent committee of the Sprint board of directors that the merger transactions are fair to and in the best interests of all of Sprint’s stockholders (including such stockholders other than SoftBank) and the recommendation of the independent committee, has determined that the business combination agreement and the transactions contemplated thereby are fair to, and in the best interests of, Sprint and its stockholders.

Please complete, date and sign the written consent furnished with this joint consent solicitation statement/prospectus and return it promptly to Sprint by one of the means described in “Solicitation of Sprint Written Consents.”

By Order of the Board of Directors,

Stefan K. Schnopp

Vice President and Corporate Secretary

October 29, 2018

TABLE OF CONTENTS

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ADDITIONAL INFORMATION

The accompanying joint consent solicitation statement/prospectus incorporates by reference important business and financial information about T-Mobile and Sprint from documents that are not included in or delivered with the accompanying joint consent solicitation statement/prospectus. This information is available without charge to you upon written or oral request. You can obtain the documents incorporated by reference in the accompanying joint consent solicitation statement/prospectus by requesting them in writing, by email or by telephone from T-Mobile or Sprint at their respective addresses and telephone numbers listed below or by accessing such documents on the websites listed below. Any other information provided on the websites listed below is not a part of the accompanying joint consent solicitation statement/prospectus and therefore is not incorporated by reference into the accompanying joint consent solicitation statement/prospectus.

In addition, if you have questions about the merger transactions, the solicitation of T-Mobile written consents or the solicitation of Sprint written consents, or if you need to obtain copies of the accompanying joint consent solicitation statement/prospectus or other documents incorporated by reference in the accompanying joint consent solicitation statement/prospectus, you may contact the appropriate contact listed above. You will not be charged for any of the documents you request.

To ensure timely delivery, any request should be made no later than November 20, 2018.

For a more detailed description of the information incorporated by reference in the accompanying joint consent solicitation statement/prospectus and how you may obtain it, see “Where You Can Find More Information.”

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ABOUT THIS JOINT CONSENT SOLICITATION STATEMENT/PROSPECTUS

This joint consent solicitation statement/prospectus, which forms part of a registration statement on Form S-4 filed with the U.S. Securities and Exchange Commission (which we refer to as the “SEC”) by T-Mobile (File No. 333-226435), constitutes a prospectus of T-Mobile under Section 5 of the U.S. Securities Act of 1933, as amended (which we refer to as the “Securities Act”), with respect to the T-Mobile common stock to be issued to Sprint stockholders pursuant to the business combination agreement. This joint consent solicitation statement/prospectus also constitutes a consent solicitation statement under Section 14(a) of the U.S. Securities Exchange Act of 1934, as amended (which we refer to as the “Exchange Act”), of T-Mobile with respect to the proposals to approve each of the T-Mobile charter amendment and the T-Mobile share issuance, and a consent solicitation statement under Section 14(a) of the Exchange Act of Sprint with respect to the proposals to approve each of the adoption of the business combination agreement and, on a nonbinding, advisory basis, the Sprint advisory T-Mobile charter amendment.

Neither T-Mobile nor Sprint has authorized anyone to give any information or make any representation about the merger transactions or any of the other transactions contemplated by the business combination agreement, T-Mobile or Sprint that is different from, or in addition to, that contained in this joint consent solicitation statement/prospectus or in any of the materials that have been incorporated by reference. Therefore, neither T-Mobile nor Sprint takes any responsibility for, or can provide any assurance as to the reliability of, any information other than the information contained in or incorporated by reference into this joint consent solicitation statement/prospectus. This joint consent solicitation statement/prospectus is dated October 29, 2018. The information contained in this joint consent solicitation statement/prospectus is accurate only as of that date or, in the case of information in a document incorporated by reference, as of the date of such document, unless the information specifically indicates that another date applies. Neither the mailing of this joint consent solicitation statement/prospectus to T-Mobile or Sprint stockholders nor the issuance by T-Mobile of common stock pursuant to the business combination agreement will create any implication to the contrary.

This joint consent solicitation statement/prospectus does not constitute an offer to sell, or the solicitation of an offer to buy, any securities, or the solicitation of a proxy, in any jurisdiction in which or from any person to whom it is unlawful to make any such offer or solicitation in such jurisdiction.

The information concerning T-Mobile contained in or incorporated by reference into this joint consent solicitation statement/prospectus has been provided by T-Mobile, and the information concerning Sprint contained in this joint consent solicitation statement/prospectus has been provided by Sprint.

Unless otherwise indicated or as the context otherwise requires, all references in this joint consent solicitation statement/prospectus to:

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QUESTIONS AND ANSWERS

The following are answers to certain questions you may have regarding the merger transactions, the other transactions contemplated by the business combination agreement, the solicitation of T-Mobile written consents and the solicitation of Sprint written consents. You are urged to read this joint consent solicitation statement/prospectus carefully and in its entirety, because the information in this section may not provide all of the information that might be important to you. Additional important information is also contained in the Annexes to, and the documents incorporated by reference into, this joint consent solicitation statement/prospectus. See “Where You Can Find More Information.”

A copy of the business combination agreement is attached as Annex A to this joint consent solicitation statement/prospectus. The business combination agreement contains the terms and conditions of the proposed transaction between T-Mobile and Sprint. Under the business combination agreement, if certain conditions are met, each SoftBank US HoldCo will merge with and into Merger Company (which we refer to, collectively, as the “HoldCo mergers”), with Merger Company continuing as the surviving entity (which we sometimes refer to as the “SoftBank surviving entity”) and as a wholly owned subsidiary of T-Mobile. Irrespective of whether the HoldCo mergers occur, subject to the satisfaction or waiver of the conditions in the business combination agreement, Merger Sub will merge with and into Sprint (which we refer to as the “merger”), with Sprint continuing as the surviving corporation (which we sometimes refer to as the “surviving corporation”) and as a wholly owned indirect subsidiary of T-Mobile. Following the merger transactions, the Sprint common stock will be delisted from the New York Stock Exchange (which we refer to as the “NYSE”) and deregistered under the Exchange Act and cease to be publicly traded.

The Sprint board of directors is providing these consent solicitation materials to the stockholders of Sprint.    

These materials also constitute a prospectus of T-Mobile with respect to the T-Mobile common stock to be issued to Sprint stockholders pursuant to the business combination agreement.

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The Sprint board of directors has set October 1, 2018 as the record date for determining the holders of shares of Sprint common stock entitled to execute and deliver written consents with respect to the Sprint proposals (which we refer to as the “Sprint record date”). Holders of Sprint common stock at the close of business on the Sprint record date will be entitled to give or withhold consent with respect to the Sprint proposals using the written consent furnished with this joint consent solicitation statement/prospectus.

In the merger, each share of Sprint common stock issued and outstanding immediately prior to the effective time (other than shares held directly by Sprint as treasury stock and shares held by the SoftBank surviving entity) will be automatically converted into the right to receive 0.10256 shares of T-Mobile common stock (which we refer to as the “merger consideration”).

Accordingly, SoftBank and its affiliates will receive the same amount of T-Mobile common stock per share of Sprint common stock in the merger transactions as all other Sprint stockholders.

No holder of Sprint common stock will be issued a fraction of a share of T-Mobile common stock in the merger transactions. Each holder of Sprint common stock converted pursuant to the merger transactions who would otherwise have been entitled to receive a fraction of a share of T-Mobile common stock (after taking into account all shares represented by the certificates and book-entry shares delivered by such holder) will receive the T-Mobile fractional share consideration as described in “The Business Combination Agreement—No Fractional Shares.”

The merger will not result in an exchange of outstanding shares of T-Mobile common stock. Accordingly, holders of shares of T-Mobile common stock immediately prior to the effective time will continue to hold their respective shares of T-Mobile common stock immediately following the effective time.

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Based on the closing price of a share of T-Mobile common stock on NASDAQ on April 27, 2018, the last trading day before public announcement of the merger transactions, the implied value of the exchange ratio to Sprint stockholders was approximately $6.62 per share. As of October 26, and assuming that each share of T-Mobile common stock will have a value equal to the closing price of a share of T-Mobile common stock on NASDAQ on such date, the implied value of the exchange ratio to Sprint stockholders is approximately $6.68 per share. You should obtain current market price quotations for T-Mobile common stock; however, as noted above, the prices at the effective time may be greater than, the same as or less than such price quotations.

Time-Based Restricted Stock Units. Each award of time-based restricted stock units in respect of shares of Sprint common stock, whether vested or unvested, that is outstanding as of immediately prior to the effective time, as of the effective time, will be automatically converted into a restricted stock unit award, on the same terms and conditions (including, if applicable, any continuing vesting requirements) under the applicable plan and award agreement in effect immediately prior to the effective time, in respect of a number of shares of T-Mobile common stock equal to the product (rounded up to the nearest whole share) of (a) the number of shares of Sprint common stock subject to such restricted stock unit as of immediately prior to the effective time multiplied by (b) 0.10256. Any accrued but unpaid dividend equivalents with respect to any award of time-based restricted stock units in respect of shares of Sprint common stock will be assumed and become an obligation with respect to the applicable award of restricted stock units in respect of shares of T-Mobile common stock.

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Performance-Based Restricted Stock Units. Each award of performance-based restricted stock units in respect of shares of Sprint common stock, whether vested or unvested, that is outstanding as of immediately prior to the effective time, as of the effective time, will be automatically converted into a restricted stock unit, on the same terms and conditions (including, if applicable, any continuing vesting requirements, but not the performance-based vesting conditions applicable to such performance-based restricted stock unit in respect of Sprint common stock immediately prior to the effective time) under the applicable plan and award agreement in effect immediately prior to the effective time, in respect of a number of shares of T-Mobile common stock equal to the product (rounded up to the nearest whole share) of (a) the number of shares of Sprint common stock subject to such restricted stock unit as of immediately prior to the effective time, multiplied by (b) 0.10256. Any accrued but unpaid dividend equivalents with respect to any award of performance-based restricted stock units in respect of shares of Sprint common stock will be assumed and become an obligation with respect to the applicable award of restricted stock units in respect of shares of T-Mobile common stock. The number of shares of Sprint common stock subject to each award of performance-based restricted stock units as of immediately prior to the effective time will be based on the assumed level of performance equal to (x) in the case of a “turnaround incentive award” issued in respect of Sprint common stock, the greatest of (1) the volume-weighted average price of Sprint common stock over any 150-calendar day period as specified in the applicable award agreement as of the effective time, (2) the volume-weighted average price of Sprint common stock over the five consecutive trading day period ending with the second complete trading day prior to the effective time, and (3) the volume-weighted average price of Sprint common stock equal to 100% of the target award; and (y) in the case of an award of performance-based restricted stock units issued in respect of shares of Sprint common stock that is not a “turnaround incentive award,” in respect of outstanding performance periods as of the effective time, the target number of shares of Sprint common stock underlying such award of performance-based restricted stock units, and in respect of completed performance periods as of the effective time, the actual number of shares of Sprint common stock underlying such award of performance-based restricted stock units.

Employees Stock Purchase Plan. Prior to the effective time, Sprint will, contingent on the completion of the merger transactions, (a) cause the purchase period then underway under the Sprint Employees Stock Purchase Plan (the “final purchase period”), to the extent it would otherwise be outstanding at the effective time, to be terminated no later than five business days prior to the effective time; (b) make any pro rata adjustments that may be necessary to reflect the final purchase period, but otherwise treat the final purchase period as a fully effective and completed purchase period; and (c) cause the exercise (as of no later than five business days prior to the effective time) of each outstanding purchase right pursuant to the Sprint Employees Stock Purchase Plan. On such exercise date, Sprint will apply the funds credited to each participant’s payroll withholding account as of such date to the purchase of whole shares of Sprint common stock in accordance with the terms of the Sprint Employees Stock Purchase Plan, and such shares of Sprint common stock will be entitled to receive the merger consideration as of the effective time.

Cash will be payable in lieu of any fractional share of T-Mobile common stock resulting from application of the 0.10256 equity award adjustment ratio.

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Following the merger transactions, the T-Mobile common stock will be the common stock of the combined company, and it is expected that the T-Mobile common stock will continue to be listed on NASDAQ under the ticker symbol “TMUS.” If you are a T-Mobile stockholder, you will continue to be a stockholder of T-Mobile immediately following the merger transactions, but you will have an interest in the businesses and assets of both T-Mobile and Sprint through your ownership of T-Mobile common stock.

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Subsequent to the execution of the business combination agreement, Deutsche Telekom and Deutsche Telekom Holding entered into a support agreement (which we refer to as the “Deutsche Telekom support agreement”) under which they agreed, promptly (and in any event within two business days) following their receipt of this joint consent solicitation statement/prospectus, to execute and deliver a written consent with respect to all of the outstanding shares of T-Mobile common stock held by Deutsche Telekom Holding, representing approximately 63.5% of the outstanding shares of T-Mobile common stock as of the T-Mobile record date, approving the T-Mobile proposals. Because Deutsche Telekom Holding is the beneficial holder of a majority of the T-Mobile common stock outstanding as of the T-Mobile record date, the delivery of the Deutsche Telekom written consent will constitute receipt by T-Mobile of the T-Mobile stockholder approval, regardless of the delivery or withholding of consent by any other T-Mobile stockholder. Therefore, T-Mobile expects to receive a number of consents sufficient to constitute the T-Mobile stockholder approval.

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Subsequent to the execution of the business combination agreement, SoftBank, SoftBank UK, Starburst and Galaxy entered into a support agreement (which we refer to as the “SoftBank support agreement”) under which they agreed, promptly (and in any event within two business days) following their receipt of this joint consent solicitation statement/prospectus, to execute and deliver a written consent with respect to all of the outstanding shares of Sprint common stock held by Starburst and Galaxy, representing approximately 84.5% of the outstanding shares of Sprint common stock as of the Sprint record date, approving the Sprint proposals (which we refer to as the “SoftBank written consent”). Because Starburst and Galaxy are, collectively, the beneficial holder of a majority of the Sprint common stock outstanding as of the Sprint record date, the delivery of the SoftBank written consent will constitute receipt by Sprint of the Sprint stockholder approval, regardless of the delivery or withholding of consent by any other Sprint stockholder. Therefore, Sprint expects to receive a number of consents sufficient to constitute the Sprint stockholder approval.

Subsequent to the execution of the business combination agreement, Deutsche Telekom and Deutsche Telekom Holding entered into the Deutsche Telekom support agreement, and SoftBank, SoftBank UK, Starburst and Galaxy entered into the SoftBank support agreement, under which they agreed to deliver written consents with respect to all of the outstanding shares of T-Mobile common stock and Sprint common stock, respectively, that they hold approving the T-Mobile proposals and the Sprint proposals, respectively. Because the principal security holders of each of T-Mobile and Sprint have agreed to deliver written consents in favor of the merger transactions, T-Mobile and Sprint are seeking written consents from all T-Mobile stockholders and all Sprint stockholders, respectively, in accordance with the applicable SEC guidance. Nevertheless, the delivery of the Deutsche Telekom written consent will constitute receipt by T-Mobile of the T-Mobile stockholder approval, regardless of the delivery or withholding of consent by any other T-Mobile stockholder, and the delivery of the SoftBank written consent will constitute receipt by Sprint of the Sprint stockholder approval, regardless of the delivery or withholding of consent by any other Sprint stockholder.

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Neither T-Mobile nor Sprint will be holding a stockholders’ meeting to consider the T-Mobile proposals or the Sprint proposals, as applicable, and therefore you will be unable to vote in person by attending a stockholders’ meeting.

If you are a Sprint stockholder at the close of business on the Sprint record date and you do not return your written consent, that will have the same effect as a vote against the Sprint proposals. However, because Starburst and Galaxy are required to deliver a written consent approving the Sprint proposals under the SoftBank support agreement, and Starburst and Galaxy are, collectively, the beneficial holders of a majority of the Sprint common stock outstanding as of the Sprint record date, a failure of any other Sprint stockholder to deliver a written consent is not expected to have any effect on the approval of the Sprint proposals.

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Sprint has set November 28, 2018 as the targeted final date for the receipt of written consents (which date, as it may be extended in accordance with the next sentence, we refer to as the “Sprint consent deadline”). Sprint reserves the right to extend the Sprint consent deadline beyond November 28, 2018. Any such extension may be made without notice to Sprint stockholders. Under the SoftBank support agreement, Starburst and Galaxy have agreed to deliver their written consents promptly, and in any event within two business days, following their receipt of this joint consent solicitation statement/prospectus. Therefore, a failure of any other Sprint stockholder to deliver a written consent is not expected to have any effect on the approval of the Sprint proposals.

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To ensure timely delivery, any request should be made no later than November 20, 2018.

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The following diagrams illustrate in simplified terms the current structure of Sprint and T-Mobile, the merger transactions and the structure of the combined company following the consummation of the merger transactions.

Simplified Structure Prior to the Merger Transactions

 

Sprint Corporation		T-Mobile US, Inc.

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RISK FACTORS

In addition to the other information contained in or incorporated by reference into this joint consent solicitation statement/prospectus, including the matters addressed under the caption “Cautionary Statement Regarding Forward-Looking Statements,” T-Mobile stockholders should carefully consider the following risks in deciding whether to approve the T-Mobile proposals, and Sprint stockholders should carefully consider the following risk factors in deciding whether to approve the Sprint proposals. You should read this joint consent solicitation statement/prospectus and its Annexes and the other documents incorporated by reference into this joint consent solicitation statement/prospectus carefully and in their entirety. See “Where You Can Find More Information.”

Risks Related to the Merger Transactions

Because the market price of T-Mobile common stock will fluctuate, Sprint stockholders cannot be sure of the value of the shares of T-Mobile common stock they will receive in the merger transactions. In addition, because the exchange ratio is fixed, the number of shares of T-Mobile common stock to be received by holders of Sprint common stock in the merger transactions will not change between now and the time the merger transactions are completed to reflect changes in the trading prices of T-Mobile common stock or Sprint common stock.

As a result of the merger transactions, each share of Sprint common stock issued and outstanding immediately prior to the effective time (other than shares held directly by Sprint as treasury stock and shares held by the SoftBank surviving entity) will be automatically converted into the right to receive 0.10256 shares of T-Mobile common stock. The exchange ratio is fixed and will not be adjusted prior to the completion of the merger transactions to account for changes in the trading prices of T-Mobile common stock or Sprint common stock or, except as otherwise set forth in the business combination agreement, other factors. The exact value of the consideration to Sprint stockholders will therefore depend on the price per share of T-Mobile common stock at the completion of the merger transactions, which may be greater than, less than or the same as the price per share of T-Mobile common stock at the time of entry into the business combination agreement or the date of this joint consent solicitation statement/prospectus.

As of October 26, 2018, and assuming that each share of T-Mobile common stock will have a value equal to the closing price of a share of T-Mobile common stock on NASDAQ on such date, the implied value of the exchange ratio to Sprint stockholders is approximately $6.68 per share. The market price of T-Mobile common stock is subject to general price fluctuations in the market for publicly traded equity securities and has experienced volatility in the past. Stock price changes may result from a variety of factors, including general market and economic conditions, changes in the businesses, operations and prospects of T-Mobile, and an evolving regulatory landscape. Market assessments of the benefits of the merger transactions and the likelihood that the merger transactions will be completed, as well as general and industry specific market and economic conditions, may also impact the market price of T-Mobile common stock. Many of these factors are beyond T-Mobile’s and Sprint’s control. You should obtain current market price quotations for T-Mobile common stock; however, as noted above, the prices at the effective time may be greater than, the same as or less than such price quotations.

The market price for T-Mobile common stock following the closing may be affected by factors different from those that historically have affected or currently affect T-Mobile common stock and Sprint common stock.

Upon completion of the merger transactions, holders of shares of Sprint common stock will receive shares of T-Mobile common stock. The combined company’s business and financial position will differ from the business and financial position of T-Mobile and Sprint before the completion of the merger and, accordingly, the results of operations of the combined company will be affected by some factors that are different from those currently affecting the results of operations of T-Mobile and those currently affecting the results of operations of

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Sprint. Accordingly, the market price and performance of T-Mobile common stock is likely to be different from the performance of Sprint common stock in the absence of the merger transactions. In addition, general fluctuations in stock markets could have a material adverse effect on the market for, or liquidity of, T-Mobile common stock, regardless of T-Mobile’s actual operating performance. For a discussion of the businesses of T-Mobile and Sprint and some important factors to consider in connection with those businesses, see the documents incorporated by reference in this joint consent solicitation statement/prospectus and referred to under “Where You Can Find More Information.”

The closing of the merger transactions is subject to a number of conditions, including the receipt of approvals from various governmental entities, which may not approve the merger transactions, may delay the approvals for, or may impose conditions or restrictions on, jeopardize or delay completion of, or reduce or delay the anticipated benefits of, the merger transactions, and if these conditions are not satisfied or waived, the merger transactions will not be completed.

The completion of the merger transactions is subject to a number of conditions, including, among others, obtaining certain governmental authorizations, consents, orders or other approvals, including the expiration or termination of applicable waiting periods under the HSR Act, the receipt of required approvals from the FCC and any PUCs or similar state and foreign regulatory bodies, clearance by CFIUS and approval by DSS, and the absence of any injunction prohibiting the merger transactions or any legal requirements enacted by a court or other governmental entity preventing the completion of the merger transactions. See “The Merger Transactions—Regulatory Approvals Required for the Merger Transactions.” There is no assurance that these required authorizations, consents, orders or other approvals will be obtained or that they will be obtained in a timely manner, or whether they will be subject to required actions, conditions, limitations or restrictions on the combined company’s business, operations or assets. If any such required actions, conditions, limitations or restrictions are imposed, they may jeopardize or delay completion of the merger transactions, reduce or delay the anticipated benefits of the merger transactions or allow the parties to terminate the business combination agreement, which could result in a material adverse effect on T-Mobile’s, Sprint’s or the combined company’s business, financial condition or operating results. In addition, the completion of the merger transactions is also subject to T-Mobile USA having specified minimum credit ratings on the closing date of the merger transactions (after giving effect to the merger) from at least two of three specified credit rating agencies, subject to certain qualifications. In the event that T-Mobile terminates the business combination agreement in connection with a failure to satisfy the closing condition related to the specified minimum credit ratings, then in certain circumstances, T-Mobile may be required to pay Sprint an amount equal to $600 million. If the merger transactions are not completed by April 29, 2019 (subject to extension to July 29, 2019, and further extension to October 29, 2019, if the only conditions not satisfied or waived (other than those conditions that by their terms are to be satisfied at the closing, which conditions are then capable of being satisfied) are conditions relating to the required regulatory and other governmental consents and the absence of restraints, and subject to the marketing period), either T-Mobile or Sprint may terminate the business combination agreement. The business combination agreement may also be terminated if the other conditions to closing are not satisfied, and T-Mobile and Sprint may also mutually decide to terminate the business combination agreement at any time prior to the HoldCo mergers effective time.

The financing of the merger transactions is not assured.

Although T-Mobile has received debt financing commitments from lenders to provide various bridge and other credit facilities to finance the merger transactions, the obligation of the lenders to provide these facilities is subject to a number of conditions. Furthermore, each of T-Mobile and Sprint may seek to modify its existing financing arrangements in connection with the merger transactions, subject to the terms of the business combination agreement, and T-Mobile and Sprint do not currently have commitments from lenders providing their existing financing arrangements for these modifications. Even if T-Mobile and Sprint are able to obtain financing or modify their existing financing arrangements, the terms of such new or modified financing arrangements may not be available to T-Mobile or Sprint on favorable terms, and T-Mobile and Sprint may incur significant costs in connection with entering into such financing. Accordingly, financing for the merger transactions may not be obtained on the expected terms or at all.

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In particular, T-Mobile has received commitments for a $19.0 billion secured bridge loan facility. T-Mobile expects to conduct one or more secured notes offerings to reduce commitments under the secured bridge facility. However, there can be no assurance that T-Mobile will be able to issue the secured notes or other long-term financing on terms it finds acceptable or at all, in which case T-Mobile may choose to borrow under the secured bridge facility. Accordingly, the costs of financing for the merger transactions may be higher than expected.

Credit rating downgrades could adversely affect the businesses, cash flows, financial condition and operating results of T-Mobile, Sprint and the combined company.

The credit ratings of T-Mobile and Sprint impact the cost and availability of future borrowings, and, as a result, cost of capital. T-Mobile’s and Sprint’s current ratings reflect each rating agency’s opinion of the company’s financial strength, operating performance and ability to meet its debt obligations or, following the completion of the merger transactions, obligations to the combined company’s obligors. Each rating agency reviews these ratings periodically and there can be no assurance that such ratings will be maintained in the future. A downgrade in the rating of either or both companies could adversely affect the businesses, cash flows, financial condition and operating results of T-Mobile, Sprint and, following the merger transactions, the combined company.

T-Mobile and Sprint directors and officers may have interests in the merger transactions different from the interests of T-Mobile stockholders and Sprint stockholders.

Certain of the directors and executive officers of T-Mobile and Sprint negotiated the terms of the business combination agreement. T-Mobile and Sprint directors and executive officers may have interests in the merger transactions that are different from, or in addition to, those of T-Mobile stockholders and Sprint stockholders, respectively. These interests include, but are not limited to, the continued service of certain directors of T-Mobile and Sprint as directors of the combined company, the continued employment of certain executive officers of T-Mobile and Sprint by the combined company, the treatment in the merger transactions of Sprint stock options, Sprint time-based restricted stock units, Sprint performance-based restricted stock units, the treatment of the Sprint Employees Stock Purchase Plan and severance and other rights held by Sprint directors and executive officers, severance agreements and amended employment terms and other rights held by T-Mobile directors and executive officers, and provisions in the business combination agreement regarding continued indemnification of and advancement of expenses to T-Mobile and Sprint directors and officers. T-Mobile stockholders and Sprint stockholders should be aware of these interests when they consider the recommendation of the T-Mobile board of directors in favor of the T-Mobile proposals and the recommendation of the Sprint board of directors in favor of the Sprint proposals, respectively.

The members of the T-Mobile board of directors and the T-Mobile independent committee were aware of and considered these interests, among other matters, in evaluating the business combination agreement and the transactions contemplated thereby, and in making the T-Mobile board of directors’ recommendation that that T-Mobile stockholders approve the T-Mobile proposals. The interests of T-Mobile directors and executive officers are described in more detail in the section of this joint consent solicitation statement/prospectus entitled “The Merger Transactions—Interests of Certain Executive Officers and Directors of T-Mobile in the Merger Transactions.”

The members of the Sprint board of directors and the Sprint independent committee were aware of and considered these interests, among other matters, in evaluating the business combination agreement and the transactions contemplated thereby, and in making the Sprint board of directors’ recommendation that Sprint stockholders approve the Sprint proposals. The interests of Sprint directors and executive officers are described in more detail in the section of this joint consent solicitation statement/prospectus entitled “The Merger Transactions—Interests of Certain Executive Officers and Directors of Sprint in the Merger Transactions.”

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The governance arrangements of the combined company will be different from the current governance arrangements of each of T-Mobile and Sprint.

Upon completion of the merger transactions, the rights of former Sprint stockholders who receive shares of T-Mobile common stock, and the rights of T-Mobile stockholders who continue to hold shares of T-Mobile common stock, will be governed by the T-Mobile certificate of incorporation and the bylaws of T-Mobile, in each case as amended and restated in accordance with the business combination agreement, and by Delaware law. You should carefully review the forms of the T-Mobile certificate of incorporation and the bylaws of T-Mobile to be in effect at the effective time, copies of the forms of which are attached as Annex D and Annex E, respectively, to this joint consent solicitation statement/prospectus. By becoming a stockholder in T-Mobile, former holders of Sprint common stock are deemed to have notice of and to have consented to the provisions of the T-Mobile certificate of incorporation and the bylaws of T-Mobile, including with respect to the provisions that are described elsewhere in this joint consent solicitation statement/prospectus. See “Comparison of Stockholders’ Rights.”

The governance arrangements of the combined company are different from the existing governance arrangements of each of T-Mobile and Sprint. Deutsche Telekom is currently the controlling stockholder of T-Mobile, and SoftBank is currently the controlling stockholder of Sprint. Following the completion of the merger transactions, Deutsche Telekom will retain the power to vote a majority of the T-Mobile common stock, and T-Mobile will therefore continue to be a “controlled company” for purposes of NASDAQ rules; however, the combined company will have the governance arrangements set forth in the business combination agreement and the other agreements described elsewhere in this joint consent solicitation statement/prospectus, and the combined company will be governed by the T-Mobile certificate of incorporation and the bylaws of T-Mobile, in each case as amended and restated in accordance with the business combination agreement, copies of the forms of which are attached as Annex D and Annex E, respectively, to this joint consent solicitation statement/prospectus, and T-Mobile, Deutsche Telekom and SoftBank will enter into the amended and restated stockholders’ agreement, a copy of the form of which is attached as Annex F to this joint consent solicitations statement/prospectus. See “Comparison of Stockholders’ Rights” and “Stockholders’ and Proxy Agreements.”

Following the merger transactions, the composition of the combined company board of directors will be different than the composition of the current T-Mobile board of directors or the current Sprint board of directors.

The T-Mobile board of directors currently consists of 12 directors and the Sprint board of directors currently consists of ten directors. Upon completion of the merger transactions, the T-Mobile board of directors, which will be the board of directors of the combined company, will consist of 14 directors, including nine directors designated by Deutsche Telekom, four directors designated by SoftBank and the chief executive officer of the combined company. See “The Merger Transactions—Board of Directors and Management of the Combined Company” and “Stockholders’ and Proxy Agreements.” This new composition of the T-Mobile board of directors may affect the future decisions of the combined company.

Stockholders will not be entitled to appraisal rights in connection with the merger transactions.

Appraisal rights are statutory rights that, if applicable under law, enable stockholders to dissent from an extraordinary transaction, such as a merger, and to demand that the corporation pay the fair value for their shares as determined by a court in a judicial proceeding instead of receiving the consideration offered to stockholders in connection with the extraordinary transaction. Under the DGCL, stockholders do not have appraisal rights if the shares of stock they hold, as of the record date for determination of stockholders entitled to vote at the meeting of stockholders to act upon a merger, are either (i) listed on a national securities exchange or (ii) held of record by more than 2,000 holders, unless the stockholders receive in exchange for their shares anything other than shares of stock of the surviving or resulting corporation (or depositary receipts in respect thereof), or of any other corporation that is publicly listed or held by more than 2,000 holders of record, cash in lieu of fractional shares or

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fractional depositary receipts described above or any combination of the foregoing. Because T-Mobile common stock is listed on NASDAQ, a national securities exchange, and because Sprint stockholders will receive in the merger transactions only shares of T-Mobile common stock, which will be publicly listed on NASDAQ upon the effective time, and cash in lieu of fractional shares, stockholders will not be entitled to appraisal rights in connection with the merger transactions.

The opinions of T-Mobile’s and Sprint’s respective financial advisors do not reflect changes in circumstances that may have occurred or that may occur between the signing of the business combination agreement and the completion of the merger transactions.

Neither the T-Mobile board of directors or the T-Mobile independent committee, nor the Sprint board of directors or the Sprint independent committee, has obtained updated opinions from their respective financial advisors as of the date of this joint consent solicitation statement/prospectus, nor do any of them expect to receive updated, revised or reaffirmed opinions prior to the completion of the merger transactions. Changes in the operations and prospects of T-Mobile or Sprint, general market and economic conditions and other factors that may be beyond the control of T-Mobile or Sprint, and on which T-Mobile’s and Sprint’s financial advisors’ opinions were based, may significantly alter the value of T-Mobile or Sprint or the share prices of T-Mobile common stock or Sprint common stock by the time the merger transactions are completed. The opinions do not speak as of the time the merger transactions will be completed or as of any date other than the date of such opinions. Because T-Mobile’s and Sprint’s financial advisors will not be updating their opinions, the opinions will not address the fairness of the merger consideration from a financial point of view at the time the merger transactions are completed. The T-Mobile board of directors’ recommendation that T-Mobile stockholders approve the T-Mobile proposals and the Sprint board of directors’ recommendation that Sprint stockholders approve the Sprint proposals, however, are made as of the date of this joint consent solicitation statement/prospectus. For a description of the opinions that the T-Mobile board of directors, the T-Mobile independent committee, the Sprint board of directors and the Sprint independent committee received from their respective financial advisors, see “The Merger Transactions—Opinions of T-Mobile’s Financial Advisors” and “The Merger Transactions—Opinions of Sprint’s Financial Advisors.”

The business combination agreement contains provisions that restrict the ability of each of the T-Mobile board of directors and the Sprint board of directors to pursue alternatives to the merger transactions.

The business combination agreement contains non-solicitation provisions that restrict the ability of each of T-Mobile and Sprint to solicit, initiate, knowingly encourage or knowingly take any other action designed to facilitate, any inquiries regarding, or the making of, any proposal the completion of which would constitute an alternative transaction for purposes of the business combination agreement. In addition, the business combination agreement does not permit T-Mobile or Sprint to terminate the business combination agreement in order to enter into an agreement providing for, or to complete, such an alternative transaction, even if the alternative transaction provides for the payment of consideration with a higher per share cash or market value than the market value proposed to be received or realized in the merger transactions. See “The Business Combination Agreement—Covenants and Agreements—No Solicitation; Third-Party Acquisition Proposals.”

A significant stockholder of each of T-Mobile and Sprint has executed a support agreement that requires such stockholder to deliver a written consent in favor of the T-Mobile proposals and the Sprint proposals, as applicable, which will constitute approval of the merger transactions by T-Mobile stockholders and Sprint stockholders, respectively, even if the T-Mobile board of directors or the Sprint board of directors changes its recommendation.

Subsequent to the execution of the business combination agreement, Deutsche Telekom and Deutsche Telekom Holding entered into the Deutsche Telekom support agreement under which they agreed, promptly (and in any event within two business days) following their receipt of this joint consent solicitation statement/prospectus, to execute and deliver a written consent with respect to all of the outstanding shares of T-Mobile

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common stock held by Deutsche Telekom Holding, representing approximately 63.5% of the outstanding shares of T-Mobile common stock as of the T-Mobile record date, approving the T-Mobile proposals. The delivery of the Deutsche Telekom written consent will constitute receipt by T-Mobile of the T-Mobile stockholder approval, and Deutsche Telkom Holding is required to deliver the Deutsche Telekom written consent even if the T-Mobile board of directors changes its recommendation to the stockholders of T-Mobile. Therefore, T-Mobile expects to receive a number of consents sufficient to constitute the T-Mobile stockholder approval.

Subsequent to the execution of the business combination agreement, SoftBank, SoftBank UK, Starburst and Galaxy entered into the SoftBank support agreement under which they agreed, promptly (and in any event within two business days) following their receipt of this joint consent solicitation statement/prospectus, to execute and deliver a written consent with respect to all of the outstanding shares of Sprint common stock held by Starburst and Galaxy, representing approximately 84.5% of the outstanding shares of Sprint common stock as of the Sprint record date, approving the Sprint proposals. The delivery of the SoftBank written consent will constitute receipt by Sprint of the Sprint stockholder approval, and Starburst and Galaxy are required to deliver the SoftBank written consent even if the Sprint board of directors changes its recommendation to the stockholders of Sprint. Therefore, Sprint expects to receive a number of consents sufficient to constitute the Sprint stockholder approval.

T-Mobile and Sprint are subject to various uncertainties, including litigation and contractual restrictions and requirements while the merger transactions are pending that could disrupt T-Mobile’s, Sprint’s or the combined company’s business and adversely affect T-Mobile’s, Sprint’s or the combined company’s business, assets, liabilities, prospects, outlook, financial condition and results of operations.

Uncertainty about the effect of the merger transactions on employees, customers, suppliers, vendors, distributors, dealers and retailers may have an adverse effect on T-Mobile, Sprint or the combined company. These uncertainties may impair the ability to attract, retain and motivate key personnel during the pendency of the merger transactions and, if the merger transactions are completed, for a period of time thereafter, as existing and prospective employees may experience uncertainty about their future roles with the combined company. If key employees depart because of issues related to the uncertainty and difficulty of integration or a desire not to remain with the combined company, the combined company’s business following the completion of the merger transactions could be negatively impacted. T-Mobile, Sprint or the combined company may have to incur significant costs in identifying, hiring and retaining replacements for departing employees and may lose significant expertise and talent. Additionally, these uncertainties could cause customers, suppliers, distributors, dealers, retailers and others to seek to change or cancel existing business relationships with T-Mobile, Sprint or the combined company or fail to renew existing relationships. Suppliers, distributors and content and application providers may also delay or cease developing for T-Mobile, Sprint or the combined company new products that are necessary for the operations of its business due to the uncertainty created by the merger transactions. Competitors may also target T-Mobile’s or Sprint’s existing customers by highlighting potential uncertainties and integration difficulties that may result from the merger transactions.

The business combination agreement also restricts each of T-Mobile and Sprint, without the other’s consent, from taking certain actions outside of the ordinary course of business while the merger transactions are pending, including, among other things, certain acquisitions or dispositions of businesses and assets, entering into or amending certain contracts, repurchasing or issuing securities, making capital expenditures and incurring indebtedness, in each case subject to certain exceptions. See “The Business Combination Agreement—Covenants and Agreements” for a description of certain restrictive covenants applicable to T-Mobile and Sprint. These restrictions may have a significant negative impact on T-Mobile’s or Sprint’s business, results of operations and financial condition.

Management and financial resources have been diverted and will continue to be diverted toward the completion of the merger transactions. T-Mobile and Sprint have incurred, and expect to incur, significant costs, expenses and fees for professional services and other transaction costs in connection with the merger transactions. These costs could adversely affect T-Mobile’s, Sprint’s or the combined company’s financial condition and results of operations.

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In addition, T-Mobile, Sprint and their respective affiliates are involved in various disputes, governmental and/or regulatory inspections, investigations and proceedings and litigation matters that arise from time to time, and it is possible that an unfavorable resolution of these matters could adversely affect T-Mobile or Sprint and their respective results of operations, financial condition and cash flows and the results of operations, financial condition and cash flows of the combined company.

Failure to complete the merger could negatively impact T-Mobile and Sprint and their respective businesses, assets, liabilities, prospects, outlook, financial condition or results of operations.

If the merger is not completed for any reason, T-Mobile and Sprint may be subject to a number of material risks. The price of T-Mobile common stock and of Sprint common stock may decline to the extent that their current market prices reflect a market assumption that the merger will be completed. In addition, some costs related to the merger transactions must be paid by T-Mobile and Sprint whether or not the merger transactions are completed. Furthermore, T-Mobile and Sprint may experience negative reactions from their respective stockholders, customers, employees, suppliers, distributors, retailers, dealers and others who deal with T-Mobile and Sprint, which could have an adverse effect on their respective businesses, financial condition and results of operations.

In addition, it is expected that if the merger is not completed, T-Mobile and Sprint will continue to lack the network, scale and financial resources of the current market share leaders in, and other companies that have more recently begun providing, wireless services. Further, if the merger is not completed, it is expected that T-Mobile and Sprint will not be able to deploy a nationwide 5G network on the same scale and on the same timeline as the combined company. For example, T-Mobile’s standalone 5G network would have substantially less capacity

than the combined company’s 5G network, while Sprint’s standalone 5G network would be geographically limited due to Sprint’s limited current network footprint on which to build 5G sites and the cost of utilizing 2.5 GHz spectrum for 5G. As a result, if the merger is not completed, it is expected that T-Mobile and Sprint will continue to be limited in their respective abilities to compete effectively in the 5G era.

Only in the event that the HoldCo mergers are completed is the closing of the merger conditioned upon the receipt of an opinion of counsel to the effect that the merger will qualify as a “reorganization” within the meaning of Section 368(a) of the Code, and neither T-Mobile nor Sprint intends to request a ruling from the IRS regarding the U.S. federal income tax consequences of the merger.

It is intended that the merger will qualify as a “reorganization” within the meaning of Section 368(a) of the Code, and that U.S. holders of Sprint common stock will not recognize gain or loss, except with respect to the receipt of cash in lieu of fractional shares of T-Mobile common stock. Only in the event that the HoldCo mergers are consummated is the closing of the merger conditioned upon receipt of an opinion of counsel to the effect that the merger will qualify as a “reorganization”. Otherwise, the merger will be completed without the receipt of any tax opinion from counsel. Furthermore, neither T-Mobile nor Sprint intends to request a ruling from the IRS regarding the United States federal income tax consequences of the merger. Accordingly, there can be no assurance that the merger will so qualify. See “Material U.S. Federal Income Tax Consequences of the Merger.” Sprint stockholders should consult their own tax advisors.

Litigation relating to the merger transactions may be filed against the T-Mobile board of directors and/or the Sprint board of directors that could prevent or delay the completion of the merger transactions and/or result in the payment of damages following the completion of the merger transactions.

In connection with the merger transactions, it is possible that stockholders of T-Mobile and/or Sprint may file putative class action lawsuits against the T-Mobile board of directors and/or the Sprint board of directors. Among other remedies, these stockholders could seek damages and/or to enjoin the merger transactions. The outcome of any litigation is uncertain and any such potential lawsuits could prevent or delay the completion of the merger transactions and/or result in substantial costs to T-Mobile and/or Sprint. Any such actions may create uncertainty relating to the merger transactions and may be costly and distracting to management. Further, the

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defense or settlement of any lawsuit or claim that remains unresolved at the time the merger transactions are completed may adversely affect the combined company’s business, financial condition, results of operations and cash flows.

Risks Related to the Business of the Combined Company

Although T-Mobile and Sprint expect that the merger transactions will result in synergies and other benefits, those synergies and benefits may not be realized or may not be realized within the expected time frame.

The ability of T-Mobile and Sprint to realize the anticipated benefits of the merger transactions will depend, to a large extent, on the combined company’s ability to integrate T-Mobile’s and Sprint’s businesses in a manner that facilitates growth opportunities and achieves the projected standalone cost savings and revenue growth trends identified by each company without adversely affecting current revenues and investments in future growth. In addition, some of the anticipated synergies are not expected to occur for a significant time period following the completion of the merger transactions and will require substantial capital expenditures in the near term to be fully realized. Even if the combined company is able to integrate the two companies successfully, the anticipated benefits of the merger transactions, including the expected synergies and network benefits, may not be realized fully or at all or may take longer to realize than expected.

T-Mobile’s business and Sprint’s business may not be integrated successfully or such integration may be more difficult, time consuming or costly than expected. Operating costs, customer loss and business disruption, including difficulties in maintaining relationships with employees, customers, suppliers or vendors, may be greater than expected following the merger transactions. Revenues following the merger transactions may be lower than expected.

The combination of two independent businesses is complex, costly and time-consuming and may divert significant management attention and resources to combining T-Mobile’s and Sprint’s business practices and operations. This process may disrupt T-Mobile’s and Sprint’s businesses. The failure to meet the challenges involved in combining the two businesses and to realize the anticipated benefits of the merger transactions could cause an interruption of, or a loss of momentum in, the activities of the combined company and could adversely affect the results of operations of the combined company. The overall combination of T-Mobile’s and Sprint’s businesses may also result in material unanticipated problems, expenses, liabilities, competitive responses, and loss of customer and other business relationships. The difficulties of combining the operations of the companies include, among others:

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Many of these factors are outside of the control of T-Mobile and Sprint and/or will be outside the control of the combined company, and any one of them could result in lower revenues, higher costs and diversion of management time and energy, which could materially impact the business, financial condition and results of operations of the combined company. In addition, even if the operations of the businesses of T-Mobile and Sprint are integrated successfully, the full benefits of the merger may not be realized, including, among others, the synergies, cost savings or sales or growth opportunities that are expected. These benefits may not be achieved within the anticipated time frame or at all. Further, additional unanticipated costs may be incurred in the integration of the businesses of T-Mobile and Sprint. All of these factors could cause dilution to the earnings per share of the combined company, decrease or delay the projected accretive effect of the merger, and negatively impact the price of T-Mobile common stock following the merger. As a result, it cannot be assured that the combination of T-Mobile and Sprint will result in the realization of the full benefits expected from the merger transactions within the anticipated time frames or at all.

The financial analyses, estimates and forecasts considered by T-Mobile and Sprint and their respective financial advisors may not be realized, which may adversely affect the market price of T-Mobile common stock following the merger.

In performing their financial analyses and rendering their opinions regarding the fairness, from a financial point of view, of the exchange ratio to T-Mobile, holders of T-Mobile common stock and holders of Sprint common stock, as applicable, each of the respective financial advisors to T-Mobile and Sprint relied on, among other things, internal financial analyses, estimates and forecasts relating to T-Mobile and Sprint prepared by or at the direction of the managements of T-Mobile and Sprint, as applicable. See “The Merger Transactions—T-Mobile Unaudited Prospective Financial Information” and “The Merger Transactions—Sprint Unaudited Prospective Financial Information.” The unaudited prospective financial information of T-Mobile and Sprint was not prepared with a view toward public disclosure, and the unaudited prospective financial information and the estimated synergies were not prepared with a view toward compliance with published guidelines of the SEC or the guidelines established by the American Institute of Certified Public Accountants for preparation and presentation of prospective financial information. These projections are inherently uncertain and based on various assumptions and estimates that are subject to the judgment of those preparing them. These projections are also subject to significant economic, competitive, industry and other uncertainties and contingencies, all of which are difficult or impossible to predict and many of which are beyond the control of T-Mobile and Sprint. There can be no assurance that T-Mobile’s, Sprint’s or the combined company’s financial condition or results of operations will be consistent with those set forth in such projections, which could have a material impact on the market price of T-Mobile common stock following the merger.

The indebtedness of the combined company following the completion of the merger transactions will be substantially greater than the indebtedness of each of T-Mobile and Sprint on a standalone basis prior to the execution of the business combination agreement. This increased level of indebtedness could adversely affect the combined company’s business flexibility and increase its borrowing costs.

In connection with the merger transactions, T-Mobile and Sprint have conducted, and expect to conduct, certain pre-merger financing transactions, which will be used in part to prepay a portion of T-Mobile’s and Sprint’s existing indebtedness and to fund liquidity needs. After giving effect to the pre-merger financing transactions, the merger transactions and the other transactions contemplated by the business combination agreement, T-Mobile and Sprint anticipate that the combined company will have consolidated indebtedness of approximately $75.0 billion to $77.0 billion, based on estimated December 31, 2018 debt and cash balances and excluding tower obligations.

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T-Mobile’s substantially increased indebtedness following the merger transactions will have the effect, among other things, of reducing its flexibility to respond to changing business, economic, market and industry conditions and increasing the amount of cash required to meet interest payments. In addition, this increased level of indebtedness following the merger transactions may reduce funds available to support efforts to combine the businesses of T-Mobile and Sprint and realize the expected benefits of the merger transactions, and may also reduce funds available for capital expenditures, share repurchases and other activities that may put the combined company at a competitive disadvantage relative to other companies with lower debt levels. Further, it may be necessary for the combined company to incur substantial additional indebtedness in the future, subject to the restrictions contained in its debt instruments, which could increase the risks associated with the capital structure of the combined company.

Because of the substantial indebtedness of the combined company following the completion of the merger transactions, there is a risk that the combined company may not be able to service its debt obligations in accordance with their terms.

The ability of the combined company to service its substantial debt obligations following the merger transactions will depend in part on future performance, which will be affected by business, economic, market and industry conditions and other factors, including the ability of the combined company to achieve the expected benefits of the merger transactions. There is no guarantee that the combined company will be able to generate sufficient cash flow to service its debt obligations when due. If the combined company is unable to meet such obligations or fails to comply with the financial and other restrictive covenants contained in the agreements governing such debt obligations, it may be required to refinance all or part of its debt, sell important strategic assets at unfavorable prices or make additional borrowings. The combined company may not be able to, at any given time, refinance its debt, sell assets or make additional borrowings on commercially reasonable terms or at all, which could have a material adverse effect on its business, financial condition and results of operations after the merger transactions.

In addition, some or all of the combined company’s variable-rate indebtedness may use the London Inter-Bank Offered Rate or similar rates (which we refer to as “LIBOR”) as a benchmark for establishing the rate. LIBOR is the subject of recent national, international and other regulatory guidance and proposals for reform. These reforms and other pressures may cause LIBOR to disappear entirely or to perform differently than in the past. The consequence of these developments cannot be entirely predicted, but could include an increase in the cost of the combined company’s variable rate indebtedness.

The agreements governing the combined company’s indebtedness and other financings will include restrictive covenants that limit the combined company’s operating flexibility.

The agreements governing the combined company’s indebtedness and other financings will impose material operating and financial restrictions on the combined company. These restrictions, subject in certain cases to customary baskets, exceptions and maintenance and incurrence-based financial tests, may limit the combined company’s ability to engage in transactions and pursue strategic business opportunities, including the following:

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These restrictions could limit the combined company’s ability to obtain debt financing, make share repurchases, refinance or pay principal on its outstanding indebtedness, complete acquisitions for cash or indebtedness or react to business, economic, market and industry conditions and other changes in its operating environment or the economy. Any future indebtedness that the combined company incurs may contain similar or more restrictive covenants. Any failure to comply with the restrictions of the combined company’s debt agreements may result in an event of default under these agreements, which in turn may result in defaults or acceleration of obligations under these and other agreements, giving the combined company’s lenders the right to terminate any commitments they had made to provide it with further funds and to require the combined company to repay all amounts then outstanding.

T-Mobile and Sprint have incurred, and will incur, direct and indirect costs as a result of the merger transactions.

T-Mobile and Sprint have incurred, and will incur, substantial expenses in connection with and as a result of completing the merger transactions, and over a period of time following the completion of the merger transactions, the combined company also expects to incur substantial expenses in connection with integrating and coordinating the businesses, operations, policies and procedures of T-Mobile and Sprint. A portion of the transaction costs related to the merger transactions will be incurred regardless of whether the merger transactions are completed. While T-Mobile and Sprint have assumed that a certain level of transaction expenses will be incurred, factors beyond T-Mobile’s and Sprint’s control could affect the total amount or the timing of these expenses. Many of the expenses that will be incurred, by their nature, are difficult to estimate accurately. These expenses will exceed the costs historically borne by T-Mobile and Sprint. These costs could adversely affect the financial condition and results of operations of T-Mobile and Sprint prior to the merger transactions and of the combined company following the merger transactions.

The combined company’s actual financial position and results of operations may differ materially from the unaudited pro forma financial data included in this joint consent solicitation statement/prospectus.

The pro forma financial information contained in this joint consent solicitation statement/prospectus is presented for illustrative purposes only and may not be an accurate indication of what the combined company’s financial position or results of operations would have been had the merger been completed on the dates assumed. The pro forma financial information has been derived from the audited and unaudited historical financial statements of T-Mobile and Sprint, and certain adjustments and assumptions have been made regarding the combined company after giving effect to the merger transactions. The pro forma financial statements do not include, among other things, estimated cost or growth synergies, adjustments related to restructuring or integration activities, future acquisitions or disposals not yet known or probable, including those that may be required by regulatory or governmental authorities in connection with the merger transactions, or impacts of merger-related change in control provisions that are currently not factually supportable and/or probable of occurring. Certain assets and liabilities of Sprint have been measured at fair value based on various preliminary estimates using assumptions that T-Mobile’s management and Sprint’s management believe are reasonable, utilizing information currently available, including the use of benchmarking to similar transactions. The process for estimating the fair value of acquired assets and assumed liabilities requires the use of judgment in determining the appropriate assumptions and estimates. These estimates may be revised and may include additional assets acquired or liabilities assumed as additional information becomes available and as additional analyses are performed. Differences between preliminary estimates in the pro forma financial information and the final acquisition accounting will occur and could have a material impact on the pro forma financial information and the combined company’s financial position and future results of operations.

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In addition, the assumptions used in preparing the pro forma financial information may not prove to be accurate. Such assumptions can be adversely affected by known or unknown facts, risks and uncertainties, many of which are beyond T-Mobile’s or Sprint’s control. Other factors may also affect the combined company’s financial condition or results of operations following the closing. In addition, following the merger transactions, certain adjustments to the accounting policies applied by Sprint to its financial information are expected to be made in order to conform the treatment of such financial information to the accounting policies of the combined company. In certain cases, the information necessary to determine the appropriate adjustments may not be available until after the completion of the merger transactions, and therefore, when conformed, the financial information of the combined company may vary materially from the pro forma financial information contained in this joint consent solicitation statement/prospectus, including, for example, adjustments with respect to revenue recognition, expenses and depreciation.    Any material variance from the pro forma financial information may cause significant variations in the market price of the T-Mobile common stock following the merger transactions. In view of these uncertainties, the inclusion of pro forma financial information in this joint consent solicitation statement/prospectus is for illustrative purposes and does not purport to project the future consolidated results of operations or consolidated financial condition for any future period or as of any future date. The pro forma financial information represents historical results as if T-Mobile and Sprint had operated as a combined entity and does not include future benefits from the merger transactions, such as those resulting from estimated synergies, and related costs, such as those costs expected to achieve certain benefits. See “Unaudited Pro Forma Condensed Combined Financial Information.”

The merger transactions may not be accretive and may cause dilution to the earnings per share of the combined company, which may negatively affect the market price of the T-Mobile common stock.

In the merger transactions, it is currently estimated that T-Mobile will issue approximately 418 million shares of T-Mobile common stock, based upon the shares of Sprint common stock outstanding as of October 1, 2018. The issuance of these new shares could have the effect of depressing the market price of the T-Mobile common stock. In addition, T-Mobile or Sprint (or the combined company after the merger transactions) could encounter other transaction-related costs, such as the failure to realize all of the benefits anticipated in the merger transactions, which could cause dilution to the combined company’s earnings per share or decrease or delay the expected accretive effect of the merger transactions and cause a decrease in the market price of the T-Mobile common stock.

Risks Related to T-Mobile’s Business

You should read and consider the risk factors specific to T-Mobile’s business that will also affect the combined company after the merger transactions. These risks are described in Part I, Item 1A of T-Mobile’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, and in other documents that are incorporated by reference into this joint consent solicitation statement/prospectus. See “Where You Can Find More Information” for the location of information incorporated by reference in this joint consent solicitation statement/prospectus.

Risks Related to Sprint’s Business

You should read and consider the risk factors specific to Sprint’s business that will also affect the combined company after the merger transactions. These risks are described in Part I, Item 1A of Sprint’s Annual Report on Form 10-K for the fiscal year ended March 31, 2018, and in other documents that are incorporated by reference into this joint consent solicitation statement/prospectus. See “Where You Can Find More Information” for the location of information incorporated by reference in this joint consent solicitation statement/prospectus.

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This joint consent solicitation statement/prospectus contains certain “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 concerning T-Mobile, Sprint, the merger transactions and the other transactions contemplated by the business combination agreement. All statements other than statements of fact, including information concerning future results, are forward-looking statements. These forward-looking statements are generally identified by the words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “could” or similar expressions. Such forward-looking statements include, but are not limited to, statements about the benefits of the merger transactions, including anticipated future financial and operating results, synergies, accretion and growth rates, T-Mobile’s, Sprint’s and the combined company’s plans, objectives, expectations and intentions, and the expected timing of completion of the merger transactions. There are several factors which could cause actual plans and results to differ materially from those expressed or implied in forward-looking statements. Such factors include, but are not limited to, the failure to obtain, or delays in obtaining, required regulatory approvals, and the risk that such approvals may result in the imposition of conditions that could adversely affect the combined company or the expected benefits of the merger transactions, or the failure to satisfy any of the other conditions to the merger transactions on a timely basis or at all; the occurrence of events that may give rise to a right of one or both of the parties to terminate the business combination agreement; adverse effects on the market price of T-Mobile’s or Sprint’s common stock and on T-Mobile’s or Sprint’s operating results because of a failure to complete the merger transactions in the anticipated time frame or at all; inability to obtain the financing contemplated to be obtained in connection with the merger transactions on the expected terms or timing or at all; the ability of T-Mobile, Sprint and the combined company to make payments on debt or to repay existing or future indebtedness when due or to comply with the covenants contained therein; adverse changes in the ratings of T-Mobile’s or Sprint’s debt securities or adverse conditions in the credit markets; negative effects of the announcement, pendency or completion of the merger transactions on the market price of T-Mobile’s or Sprint’s common stock and on T-Mobile’s or Sprint’s operating results, including as a result of changes in key customer, supplier, employee or other business relationships; significant transaction costs, including financing costs, and unknown liabilities; failure to realize the expected benefits and synergies of the merger transactions in the expected time frames or at all; costs or difficulties related to the integration of Sprint’s network and operations into T-Mobile; the risk of litigation or regulatory actions; the inability of T-Mobile, Sprint or the combined company to retain and hire key personnel; the risk that certain contractual restrictions contained in the business combination agreement during the pendency of the merger transactions could adversely affect T-Mobile’s or Sprint’s ability to pursue business opportunities or strategic transactions; effects of changes in the regulatory environment in which T-Mobile and Sprint operate; changes in global, political, economic, business, competitive and market conditions; changes in tax and other laws and regulations; and other risks and uncertainties detailed in T-Mobile’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 and in its subsequent reports on Form 10-Q, including in the sections thereof captioned “Risk Factors” and “Cautionary Statement Regarding Forward-Looking Statements,” as well as in its subsequent reports on Form 8-K, all of which are filed with the SEC and available at www.sec.gov and www.t-mobile.com, and in Sprint’s Annual Report on Form 10-K for the fiscal year ended March 31, 2018 and in its subsequent reports on Form 10-Q, including in the sections thereof captioned “Risk Factors” and “MD&A—Forward-Looking Statements,” as well as in its subsequent reports on Form 8-K, all of which are filed with the SEC and available at www.sec.gov and www.sprint.com. Forward-looking statements are based on current expectations and assumptions, which are subject to risks and uncertainties that may cause actual results to differ materially from those expressed in or implied by such forward-looking statements. Given these risks and uncertainties, readers of this joint consent solicitation statement/prospectus are cautioned not to place undue reliance on such forward-looking statements. T-Mobile and Sprint assume no obligation to update or revise the information contained in this communication (whether as a result of new information, future events or otherwise), except as required by applicable law.

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SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA OF T-MOBILE

The following selected historical consolidated financial data is derived from T-Mobile’s audited consolidated financial statements as of and for each of the years ended December 31, 2017, 2016, 2015, 2014 and 2013 and unaudited condensed consolidated financial statements as of and for the six months ended June 30, 2018 and 2017. In the opinion of T-Mobile’s management, the interim financial data includes all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the results for the interim periods. In connection with the business combination with MetroPCS Communications, Inc. (which we refer to as “MetroPCS”), the selected financial data prior to May 1, 2013 represents T-Mobile USA’s historical financial data. The information set forth below is only a summary that you should read together with the historical audited consolidated financial statements of T-Mobile and the related notes, as well as the section entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in T-Mobile’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, as updated by the Current Report on Form 8-K filed with the SEC on June 18, 2018, along with the unaudited condensed consolidated financial statements of T-Mobile for the six month period ended June 30, 2018 contained in T-Mobile’s Quarterly Report on Form 10-Q that T-Mobile previously filed with the SEC and that are incorporated by reference into this joint consent solicitation statement/prospectus. Historical results are not necessarily indicative of any results to be expected in the future. See “Where You Can Find More Information.”

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SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA OF SPRINT

Sprint’s selected financial data presented below distinguishes between the predecessor period (which we indicate in the table below by the heading “Predecessor”) relating to Sprint Communications (formerly known as Sprint Nextel Corporation) for periods prior to the SoftBank-Sprint merger and the successor period (which we indicate in the table below by the heading “Successor”) relating to Sprint (formerly known as Starburst II) for periods subsequent to the incorporation of Starburst II on October 5, 2012. The Successor financial information represents the activity and accounts of Sprint, which includes the activity and accounts of Starburst II prior to the close of the SoftBank-Sprint merger on July 10, 2013 and Sprint Communications, inclusive of the consolidation of Clearwire Corporation, prospectively following completion of the SoftBank-Sprint merger, beginning on July 11, 2013. The accounts and operating activity of Starburst II prior to the close of the SoftBank-Sprint merger primarily related to merger expenses that were incurred in connection with the SoftBank-Sprint merger (recognized in selling, general and administrative expense) and interest related to the $3.1 billion convertible bond Sprint Communications issued to Starburst II. The Predecessor financial information represents the historical basis of presentation for Sprint Communications for all periods prior to the SoftBank-Sprint merger.

On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (which we refer to as the “Tax Act”). The Tax Act included changes in tax laws that had a material impact on the financial statements of Sprint. Based on currently available information, Sprint recorded, as a provisional estimate, a $7.1 billion non-cash tax benefit through income for continuing operations to re-measure the carrying values of its deferred tax assets and liabilities. The re-measurement of deferred taxes had no impact on cash flows. See Note 10. Income Taxes in Notes to the Consolidated Financial Statements in Sprint’s Annual Report on Form 10-K for the year ended March 31, 2018, which is incorporated by reference into this joint consent solicitation statement/prospectus, for additional information.

On January 1, 2018, Sprint adopted authoritative guidance regarding Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments. Sprint adopted this standard with retrospective application to the consolidated statements of cash flows including the impacted cash flow data in the table below. See Note 2. Summary of Significant Accounting Policies and Other Information in Notes to the Consolidated Financial Statements in Sprint’s Annual Report on Form 10-K for the year ended March 31, 2018, which is incorporated by reference into this joint consent solicitation statement/prospectus, for additional information related to the adoption of this standard.

The selected financial data presented below is not comparable for all periods presented primarily as a result of transactions such as the SoftBank-Sprint merger and acquisitions of Clearwire Corporation and certain assets of United States Cellular Corporation in 2013. All acquired companies’ results of operations subsequent to their acquisition dates are included in Sprint’s consolidated financial statements.

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SELECTED UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL DATA

The following selected unaudited pro forma condensed combined financial information presents the unaudited pro forma condensed combined balance sheet as of June 30, 2018 and the unaudited pro forma condensed combined statements of operations for the year ended December 31, 2017 and the six months ended June 30, 2018. The unaudited pro forma condensed combined balance sheet as of June 30, 2018 combines the historical unaudited condensed consolidated balance sheet of T-Mobile as of June 30, 2018 and historical audited consolidated balance sheet of Sprint as of June 30, 2018, giving effect to (1) the merger transactions as if they had been completed on June 30, 2018 and (2) the assumptions and adjustments described in the notes to the unaudited pro forma condensed combined financial information included in this joint consent solicitation statement/prospectus. The unaudited pro forma condensed combined statements of operations for the six months ended June 30, 2018 and the fiscal year ended December 31, 2017 give effect to (1) the merger transactions as if they had been completed on January 1, 2017, the beginning of T-Mobile’s most recently completed fiscal year and (2) the assumptions and adjustments described in the notes to the unaudited pro forma condensed combined financial information included in this joint consent solicitation statement/prospectus. The selected unaudited pro forma condensed combined financial information is provided for illustrative purposes only and does not purport to represent what the actual consolidated results of operations or consolidated financial condition would have been had the merger actually occurred on the dates indicated, nor do they purport to project the future consolidated results of operations or consolidated financial condition for any future period or as of any future date. Actual results may differ materially from the assumptions within the accompanying selected unaudited pro forma condensed combined financial information. The following selected unaudited pro forma condensed combined financial data should be read in conjunction with the section entitled “Unaudited Pro Forma Condensed Combined Financial Information” and related notes included in this joint consent solicitation statement/prospectus.

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COMPARATIVE HISTORICAL AND PRO FORMA PER SHARE FINANCIAL DATA

The following table sets forth selected historical per share information of T-Mobile and Sprint and unaudited pro forma combined per share information after giving effect to the merger transactions and the other transactions contemplated by the business combination agreement. The pro forma per share information gives effect to the merger transactions as if they had been completed on January 1, 2017, in the case of diluted net income per share data, and June 30, 2018, in the case of book value per share data. The pro forma per share financial information is provided for illustrative purposes only and does not purport to represent what the actual consolidated results of operations or consolidated financial condition would have been had the merger actually occurred on the dates indicated, nor do they purport to project the future consolidated results of operations or consolidated financial condition for any future period or as of any future date. Actual results may differ materially from the assumptions within the accompanying unaudited pro forma per share financial information. The following historical and unaudited pro forma per share financial data should be read in conjunction with the audited financial statements as of and for the year ended December 31, 2017 of T-Mobile, the audited financial statements as of and for the year ended March 31, 2018 of Sprint, and the section entitled “Unaudited Pro Forma Condensed Combined Financial Information” and related notes included in this joint consent solicitation statement/prospectus.

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INFORMATION ABOUT THE COMPANIES

T-Mobile

T-Mobile US, Inc.

12920 SE 38th Street

Bellevue, Washington 98006-1350

Phone: (425) 378-4000

T-Mobile is a Delaware corporation formed in 2013 through the combination of T-Mobile USA and MetroPCS. T-Mobile USA was a Delaware corporation formed in 1994 as VoiceStream Wireless PCS, a subsidiary of Western Wireless Corporation that was spun off in 1999, acquired by Deutsche Telekom in 2001 and renamed T-Mobile USA in 2002. T-Mobile is redefining the way consumers and businesses buy wireless services through leading product and service innovation. T-Mobile introduced its Un-carrier strategy in 2013 and has since announced 14 signature initiatives that have disrupted the wireless communication services industry by ending annual service contracts, overages, unpredictable international roaming fees, data buckets and more. T-Mobile’s advanced nationwide 4G LTE network provides wireless services to 74.0 million customers as of March 31, 2018. T-Mobile provides service, devices and accessories across its flagship brands, T-Mobile and MetroPCS, and through its owned and operated retail stores, third-party distributors and websites.

Merger Company

Huron Merger Sub LLC

c/o T-Mobile US, Inc.

12920 SE 38th Street

Bellevue, Washington 98006-1350

Phone: (425) 378-4000

Merger Company is a Delaware limited liability company and a direct wholly owned subsidiary of T-Mobile. Merger Company was formed on April 26, 2018 for the purpose of entering into the business combination agreement and effecting the transactions contemplated by the agreement. As of the date of the business combination agreement, Merger Company has not carried on any business, conducted any operations or incurred any liabilities or obligations other than the execution of the business combination agreement, the performance of its obligations thereunder and matters ancillary thereto.

Merger Sub

Superior Merger Sub Corporation

c/o T-Mobile US, Inc.

12920 SE 38th Street

Bellevue, Washington 98006-1350

Phone: (425) 378-4000

Merger Sub is a Delaware corporation, a direct wholly owned subsidiary of Merger Company and an indirect wholly owned subsidiary of T-Mobile. Merger Sub was incorporated on April 26, 2018 for the purpose of entering into the business combination agreement and effecting the transactions contemplated by the agreement. As of the date of the business combination agreement, Merger Sub has not carried on any business, conducted any operations or incurred any liabilities or obligations other than the execution of the business combination agreement, the performance of its obligations thereunder and matters ancillary thereto.

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Sprint

Sprint Corporation

6200 Sprint Parkway

Overland Park, Kansas 66251

Phone: (877) 564-3166

Sprint, originally named Starburst II, was incorporated in 2012 under the laws of Delaware and is a holding company with operations conducted by its subsidiaries. In 2013, SoftBank and certain of its wholly owned subsidiaries completed the SoftBank-Sprint merger. As a result of the SoftBank-Sprint merger, Sprint became the parent company of Sprint Nextel Corporation, which was renamed Sprint Communications. Sprint is a communications company that offers a comprehensive range of wireless and wireline communications products and services designed to meet the needs of not only individual consumers, but also businesses, government subscribers, and resellers. Its services are provided through its ownership of extensive wireless networks, an all-digital global wireline network and a Tier 1 internet backbone. Sprint offers wireless and wireline services to subscribers in all 50 states, Puerto Rico and the United States Virgin Islands under the Sprint corporate brand, which includes its retail brands of Sprint^®, Boost Mobile^®, Virgin Mobile^® and Assurance Wireless^® on Sprint’s wireless networks utilizing various technologies including 3G CDMA and 4G LTE. Sprint is headquartered in Overland Park, Kansas.

Starburst

Starburst I, Inc.

One Circle Star Way

San Carlos, CA 94070

Phone: (650) 562-8100

Starburst, incorporated in Delaware, is an indirect wholly owned subsidiary of SoftBank and a direct wholly owned subsidiary of SoftBank UK. It was formed in connection with SoftBank’s acquisition of Sprint Nextel Corporation for the purpose of holding SoftBank’s interest in Sprint.

Galaxy

Galaxy Investment Holdings, Inc.

One Circle Star Way

San Carlos, CA 94070

Phone: (650) 562-8100

Galaxy, incorporated in Delaware, is an indirect wholly owned subsidiary of SoftBank and a direct wholly owned subsidiary of SoftBank UK. It was formed for the purpose of holding SoftBank’s indirect interest in Sprint not held by Starburst.

Deutsche Telekom

Deutsche Telekom AG

Friedrich-Ebert-Allee 140

53113 Bonn, Germany

Phone: +49-228-181-0

Deutsche Telekom is one of the world’s leading telecommunications companies, with approximately 170 million mobile customers, 28 million fixed-network lines and 19 million broadband lines. Deutsche Telekom provides fixed-network/broadband, mobile communications, internet and internet protocol television products

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and services for consumers, and information and communication technology solutions for business and corporate customers. Deutsche Telekom is headquartered in Bonn, Germany, with a presence in more than 50 countries, including Germany and the United States.

Deutsche Telekom Holding

Deutsche Telekom Holding B.V.

Stationsplein 8K, 6221 BT

Maastricht, The Netherlands

Phone: +31 437999032

Deutsche Telekom Holding is a limited liability company (besloten vennootschap met beperkte aansprakelijkheid) organized and existing under the laws of the Netherlands and an indirect wholly owned subsidiary of Deutsche Telekom. As a result of an internal reorganization of Deutsche Telekom’s subsidiaries on December 31, 2013, Deutsche Telekom Holding directly holds the T-Mobile common stock beneficially owned by Deutsche Telekom. Deutsche Telekom Holding’s principal business purpose is to incorporate, participate and supervise companies belonging to the Deutsche Telekom group and their relevant businesses.

SoftBank

SoftBank Group Corp.

1-9-1, Higashi-Shimbashi Minato-ku

Tokyo 105-7303 Japan

+81-3-6889-2000

SoftBank is a Japanese kabushiki kaisha, originally organized in 1981. SoftBank is a pure holding company that engages in a range of businesses in the information industry, including mobile communications, broadband infrastructure, fixed-line telecommunications and internet culture. SoftBank is headquartered in Tokyo, Japan, where it seeks to use the information revolution to contribute to the wellbeing of people and society.

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SOLICITATION OF T-MOBILE WRITTEN CONSENTS

Consents

The T-Mobile board of directors is providing these consent solicitation materials to the stockholders of T-Mobile. T-Mobile stockholders are being asked to approve each of the T-Mobile charter amendment, including three sub-proposals to (1) approve an increase in the number of authorized shares of T-Mobile common stock from one billion to two billion, (2) amend the director designation rights of Deutsche Telekom and add director designation rights of SoftBank and (3) add approval rights of SoftBank, in each case, including other amendments incidental or related to the foregoing, and the T-Mobile share issuance by executing and delivering the written consent furnished with this joint consent solicitation statement/prospectus.

Shares Entitled to Consent and Consent Required

Only T-Mobile stockholders of record at the close of business on October 1, 2018 (which we refer to as the “T-Mobile record date”) will be notified of and be entitled to execute and deliver a written consent. As of the T-Mobile record date, only shares of T-Mobile common stock are eligible to consent with respect to the T-Mobile proposals. Under the T-Mobile certificate of incorporation and the DGCL, each holder of T-Mobile common stock is entitled to one vote for each share of T-Mobile common stock held as of the T-Mobile record date.

Approval of each of the T-Mobile proposals, including each of the sub-proposals included in the proposal to approve the T-Mobile charter amendment, requires the execution and delivery to T-Mobile of one or more written consents by the holders of a majority of the outstanding shares of T-Mobile common stock entitled to vote thereon. By approving each of the sub-proposals included in the proposal to approve the T-Mobile charter amendment, T-Mobile stockholders will be approving the T-Mobile charter amendment in its entirety. As of the T-Mobile record date, there were 848,381,358 shares of T-Mobile common stock outstanding and entitled to consent with respect to the T-Mobile proposals, and directors and executive officers of T-Mobile and their affiliates owned and were entitled to consent with respect to 2,851,511 shares of T-Mobile common stock (excluding shares owned by Deutsche Telekom), representing approximately 0.34% of the shares of T-Mobile common stock outstanding on that date. T-Mobile currently expects that its directors and executive officers will deliver written consents in favor of the T-Mobile proposal, although none of them has entered into any agreements obligating him or her to do so.

Subsequent to the execution of the business combination agreement, Deutsche Telekom and Deutsche Telekom Holding entered into the Deutsche Telekom support agreement under which they agreed, promptly (and in any event within two business days) following their receipt of this joint consent solicitation statement/prospectus, to execute and deliver a written consent with respect to all of the outstanding shares of T-Mobile common stock held by Deutsche Telekom Holding, representing approximately 63.5% of the outstanding shares of T-Mobile common stock as of the T-Mobile record date, approving the T-Mobile proposals. The delivery of the Deutsche Telekom written consent by Deutsche Telekom Holding will constitute receipt by T-Mobile of the T-Mobile stockholder approval. Therefore, T-Mobile expects to receive a number of consents sufficient to constitute the T-Mobile stockholder approval. For additional information, see “Support Agreements—Deutsche Telekom Support Agreement.”

Submission of Consents

You may consent to the T-Mobile proposals with respect to your shares of T-Mobile common stock by completing and signing the written consent furnished with this joint consent solicitation statement/prospectus and returning it to T-Mobile by the T-Mobile consent deadline.

If you hold shares of T-Mobile common stock at the close of business on the T-Mobile record date and you wish to give your written consent, you must fill out the enclosed written consent, date and sign it, and promptly

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return it to T-Mobile. Once you have completed, dated and signed the written consent, you may deliver it to T-Mobile by emailing a .pdf copy of your written consent to investor.relations@t-mobile.com, or by mailing your written consent to T-Mobile US, Inc., Corporate Secretary, 12920 SE 38th Street, Bellevue, Washington 98006.

The delivery of the Deutsche Telekom written consent will constitute receipt by T-Mobile of the T-Mobile stockholder approval, and a failure of any other T-Mobile stockholder to deliver a written consent is not expected to have any effect on the approval of the T-Mobile proposals.

Executing Consents; Revocation of Consents

You may execute a written consent to approve the T-Mobile proposals (which is equivalent to a vote FOR the T-Mobile proposals) or disapprove, or abstain from consenting with respect to, the T-Mobile proposals (which is equivalent to a vote AGAINST the T-Mobile proposals). If you do not return your written consent, it will have the same effect as a vote against the T-Mobile proposals. If you are a T-Mobile stockholder at the close of business on the T-Mobile record date and you return a signed written consent without indicating your decision on the T-Mobile proposals, you will have given your consent to approve the T-Mobile proposals.

Your consent to the T-Mobile proposals may be changed or revoked at any time before the T-Mobile consent deadline; however, such change or revocation is not expected to have any effect, as the delivery of the Deutsche Telekom written consent will constitute receipt by T-Mobile of the T-Mobile stockholder approval. If you wish to change or revoke a previously given consent before the T-Mobile consent deadline, you may do so by delivering a notice of revocation to the corporate secretary of T-Mobile or by delivering a new written consent with a later date.

Solicitation of Consents; Expenses

The expense of preparing, printing and mailing these consent solicitation materials is being borne 50% by T-Mobile and 50% by Sprint. Officers and employees of T-Mobile may solicit consents by telephone and personally, in addition to solicitation by mail. These persons will receive their regular compensation but no special compensation for soliciting consents.

Recommendation of the T-Mobile Board of Directors

The T-Mobile board of directors recommends that T-Mobile stockholders approve the T-Mobile charter amendment, including each of the related sub-proposals, and the T-Mobile share issuance by executing and delivering the written consent furnished with this joint consent solicitation statement/prospectus. See “The Merger Transactions—T-Mobile’s Reasons for the Merger and Recommendation of the T-Mobile Board of Directors.”

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SOLICITATION OF SPRINT WRITTEN CONSENTS

Consents

The Sprint board of directors is providing these consent solicitation materials to the stockholders of Sprint. Sprint stockholders are being asked to approve each of the adoption of the business combination agreement and, on a nonbinding, advisory basis, the Sprint advisory T-Mobile charter amendment proposal, including three sub-proposals to (1) approve an increase in the number of authorized shares of T-Mobile common stock from one billion to two billion, (2) amend the director designation rights of Deutsche Telekom and add director designation rights of SoftBank and (3) add approval rights of SoftBank, in each case, including other amendments incidental or related to the foregoing (which we refer to as the “Sprint proposals”), by executing and delivering the written consent furnished with this joint consent solicitation statement/prospectus.

Shares Entitled to Consent and Consent Required

Only Sprint stockholders of record at the close of business on October 1, 2018 (which we refer to as the “Sprint record date”) will be notified of and be entitled to execute and deliver a written consent. As of the Sprint record date, only shares of Sprint common stock are eligible to consent with respect to the Sprint proposals. Under the Sprint certificate of incorporation and the DGCL, each holder of Sprint common stock is entitled to one vote for each share of Sprint common stock held as of the Sprint record date.

Approval of each of the Sprint proposals, including each of the related sub-proposals included in the Sprint advisory T-Mobile charter amendment proposal, requires the execution and delivery to Sprint of one or more written consents by the holders of a majority of the outstanding shares of Sprint common stock entitled to vote thereon. As of the Sprint record date, there were 4,077,202,570 shares of Sprint common stock outstanding and entitled to consent with respect to the Sprint proposals, and directors and executive officers of Sprint and their affiliates owned and were entitled to consent with respect to 10,074,674 shares of Sprint common stock (excluding shares owned by SoftBank), representing approximately 0.25% of the shares of Sprint common stock outstanding on that date. Sprint currently expects that its directors and executive officers will deliver written consents in favor of the Sprint proposals, although none of them has entered into any agreements obligating him or her to do so.

Subsequent to the execution of the business combination agreement, SoftBank, SoftBank UK, Starburst and Galaxy entered into the SoftBank support agreement under which they agreed, promptly (and in any event within two business days) following their receipt of this joint consent solicitation statement/prospectus, to execute and deliver a written consent with respect to all of the outstanding shares of Sprint common stock held by Starburst and Galaxy, representing approximately 84.5% of the outstanding shares of Sprint common stock as of the Sprint record date, approving the Sprint proposals. The delivery of the SoftBank written consent will constitute receipt of the Sprint stockholder approval. Therefore, Sprint expects to receive a number of consents sufficient to constitute the Sprint stockholder approval. For additional information, see “Support Agreements—SoftBank Support Agreement.”

Submission of Consents

You may consent to the Sprint proposals with respect to your shares of Sprint common stock by completing and signing the written consent furnished with this joint consent solicitation statement/prospectus and returning it to Sprint by the Sprint consent deadline.

If you hold shares of Sprint common stock as of the Sprint record date and you wish to give your written consent, you must fill out the enclosed written consent, date and sign it, and promptly return it to Sprint. Once you have completed, dated and signed the written consent, you may deliver it to Sprint by emailing a .pdf copy of your written consent to shareholder.relations@sprint.com, or by mailing your written consent to Corporate Secretary, 6200 Sprint Parkway, Mailstop KSOPHF0302-3B679, Overland Park, KS 66251.

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The delivery of the SoftBank written consent will constitute receipt by Sprint of the Sprint stockholder approval, and a failure of any other Sprint stockholder to deliver a written consent is not expected to have any effect on the approval of the Sprint proposals.

Executing Consents; Revocation of Consents

You may execute a written consent to approve the Sprint proposals (which is equivalent to a vote FOR the Sprint proposals) or disapprove, or abstain from consenting with respect to, the Sprint proposals (which is equivalent to a vote AGAINST the Sprint proposals). If you do not return your written consent, it will have the same effect as a vote against the Sprint proposals. If you are a record holder at the close of business on the Sprint record date and you return a signed written consent without indicating your decision on the Sprint proposals, you will have given your consent to approve the Sprint proposals.

Your consent to the Sprint proposals may be changed or revoked at any time before the Sprint consent deadline; however, such change or revocation is not expected to have any effect, as the delivery of the SoftBank written consent will constitute receipt by Sprint of the Sprint stockholder approval. If you wish to change or revoke a previously given consent before the Sprint consent deadline, you may do so by delivering a notice of revocation to the corporate secretary of Sprint or by delivering a new written consent with a later date.

Solicitation of Consents; Expenses

The expense of preparing, printing and mailing these consent solicitation materials is being borne 50% by Sprint and 50% by T-Mobile. Officers and employees of Sprint may solicit consents by telephone and personally, in addition to solicitation by mail. These persons will receive their regular compensation but no special compensation for soliciting consents.