Where You Can Find More Information

WHERE YOU CAN FIND MORE INFORMATION

Both T-Mobile and Sprint file annual, quarterly and current reports, proxy statements and other business and financial information with the SEC. You may read and copy any materials that either T-Mobile or Sprint files with the SEC at the SEC’s Public Reference Room at 100 F Street, N.E., Room 1580, Washington, D.C. 20549, at prescribed rates. Please call the SEC at (800) SEC-0330 ((800) 732-0330) for further information on the Public Reference Room. In addition, T-Mobile and Sprint file reports and other business and financial information with the SEC electronically, and the SEC maintains a website located at www.sec.gov containing this information. You will also be able to obtain these documents, free of charge, from T-Mobile’s website at www.t-mobile.com under the “Investor Relations” link, or from Sprint’s website at www.sprint.com under the “Investor Relations” link. The information contained on the websites of T-Mobile, Sprint and the SEC (except for the filings described below) is not incorporated by reference into this joint consent solicitation statement/prospectus.

T-Mobile has filed a registration statement on Form S-4 of which this joint consent solicitation statement/prospectus forms a part with respect to the T-Mobile common stock to be issued in the merger transactions. This joint consent solicitation statement/prospectus constitutes the prospectus of T-Mobile filed as part of the registration statement. As permitted by SEC rules, this joint consent solicitation statement/prospectus does not contain all of the information included in the registration statement or in the exhibits or schedules to the registration statement. You may read and copy the registration statement, including any amendments, schedules and exhibits at the addresses set forth below. Statements contained in this joint consent solicitation statement/prospectus as to the contents of any contract or other documents referred to in this joint consent solicitation statement/prospectus are not necessarily complete. In each case, you should refer to the copy of the applicable contract or other document filed as an exhibit to the registration statement. This joint consent solicitation statement/prospectus incorporates by reference documents that T-Mobile and Sprint have previously filed with the SEC, including those listed below.

You should rely only on the information contained in this joint consent solicitation statement/prospectus or to which you have been referred. T-Mobile and Sprint have not authorized anyone to provide you with any additional information. This joint consent solicitation statement/prospectus is dated as of the date listed on the cover page. You should not assume that the information contained in this joint consent solicitation statement/prospectus is accurate as of any date other than such date, and neither the mailing or posting of this joint consent solicitation statement/prospectus to stockholders of T-Mobile or Sprint nor the issuance of T-Mobile common stock in the merger transactions will create any implication to the contrary.

This joint consent solicitation statement/prospectus also incorporates by reference the following documents that have previously been filed with the SEC by T-Mobile (File No. 001–33409):

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Annual Report on Form 10-K for the fiscal year ended December 31, 2017, filed on February 8, 2018, as updated by the Current Report on Form 8-K filed on June 18, 2018;

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Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2018, filed on May 1, 2018;

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Current Reports on Form 8-K (only to the extent “filed” and not “furnished”), filed on January 22, 2018 (two filings), January 25, 2018, February 21, 2018, February 22, 2018, March 30, 2018, April 30, 2018, May 4, 2018, May 17, 2018, May 21, 2018, June 14, 2018 and June 18, 2018; and

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Definitive Proxy Statement on Schedule 14A, filed on April 26, 2018.

This joint consent solicitation statement/prospectus incorporates by reference the following documents that have previously been filed with the SEC by Sprint (File No. 001–04721):

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Annual Report on Form 10-K for the fiscal year ended March 31, 2018, filed on May 24, 2018;

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Current Reports on Form 8-K (only to the extent “filed” and not “furnished”), filed on April 30, 2018, May 2, 2018, May 14, 2018, May 18, 2018, May 30, 2018, June 6, 2018 and July 2, 2018; and

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Definitive Proxy Statement on Schedule 14A, filed on June 26, 2018.

All additional documents that either T-Mobile or Sprint may file with the SEC pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this joint consent solicitation statement/prospectus and prior to the receipt of the T-Mobile stockholder approval and the Sprint stockholder approval will also be deemed to be incorporated by reference. However, some documents or information, such as that called for by Item 2.02 and Item 7.01 of Form 8-K, or the exhibits related thereto under Item 9.01 of Form 8-K, are deemed furnished and not filed in accordance with SEC rules. None of those documents or that information is deemed to be incorporated by reference into this joint consent solicitation statement/prospectus. Additionally, except as expressly stated with respect to the filings described above, to the extent this joint consent solicitation statement/prospectus contains references to the websites of T-Mobile or Sprint, the information on those websites does not constitute a part of, and is not incorporated by reference into, this joint consent solicitation statement/prospectus.

If you are a stockholder of T-Mobile, you can obtain any of the documents incorporated by reference through T-Mobile or the SEC. Documents incorporated by reference are available from T-Mobile without charge, excluding all exhibits unless such exhibits have been specifically incorporated by reference in this joint consent solicitation statement/prospectus. You will not receive copies of the documents incorporated by reference, as they are not being sent to stockholders unless specifically requested. You may obtain documents incorporated by reference in this joint consent solicitation statement/prospectus free of charge by requesting them in writing or by telephone as follows or by accessing the website listed below:

T-Mobile Investor Relations

1 Park Avenue, 14th Floor

New York, New York 10016

Telephone: (212) 358-3210

www.t-mobile.com

To ensure timely delivery of the documents, T-Mobile stockholders must make their requests no later than [                ], 2018.

If you are a stockholder of Sprint, you can obtain any of the documents incorporated by reference through Sprint or the SEC. Documents incorporated by reference are available from Sprint without charge, excluding all exhibits unless such exhibits have been specifically incorporated by reference in this joint consent solicitation statement/prospectus. You will not receive copies of the documents incorporated by reference, as they are not being sent to stockholders unless specifically requested. You may obtain documents incorporated by reference in this joint consent solicitation statement/prospectus free of charge by requesting them in writing or by telephone as follows or by accessing the website listed below:

Sprint Shareholder Relations

6200 Sprint Parkway, Mailstop KSOPHF0302-3B679

Overland Park, Kansas 66251

Telephone: (913) 794-1091

www.sprint.com

To ensure timely delivery of the documents, Sprint stockholders must make their requests no later than [                ], 2018.

Any statement contained in a document incorporated or deemed to be incorporated by reference into this joint consent solicitation statement/prospectus will be deemed to be modified or superseded for purposes of this joint consent solicitation statement/prospectus to the extent that a statement contained in this joint consent solicitation statement/prospectus or any other subsequently filed document that is deemed to be incorporated by reference into this joint consent solicitation statement/prospectus modifies or supersedes the statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of this joint consent solicitation statement/prospectus. Any statement concerning the contents of any contract or other document filed as an exhibit to the registration statement is not necessarily complete. With respect to each contract or other document filed as an exhibit to the registration statement, you are referred to that exhibit for a more complete description of the matter involved, and each such statement is qualified in its entirety by such reference.