AMENDMENT NO. 2 TO EMPLOYMENT AGREEMENT between T-Mobile US,Inc., (the Company) and John Legere (the Executive) Dated February 25, 2015

Exhibit 10.1

AMENDMENT NO. 2 TO

EMPLOYMENT AGREEMENT

between

T-Mobile US, Inc., (the “Company”)

and

John Legere (the “Executive”)

Dated February 25, 2015

WITNESSETH:

WHEREAS, Executive entered into an Employment Agreement with T-Mobile USA, Inc., a wholly-owned subsidiary of the Company, dated and effective as of September 22, 2012, which was subsequently amended by an amendment agreement between the Company and the Executive dated October 23, 2013 (the “Employment Agreement”); and

WHEREAS, the parties wish to amend the Employment Agreement as set forth in this instrument (the “Amendment”) to (i) extend the original term of the Employment Agreement by two years and (ii) reflect changes to the Company’s incentive compensation practices.

NOW THEREFORE, in consideration of the promises and the mutual covenants hereinafter set forth, and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties agree as follows:

The first sentence of paragraph 2 of the Employment Agreement is amended effective as of the date hereof to read as follows:

“The term of the Executive’s employment with the Company under this Agreement shall commence on the Effective Date and continue to the fifth anniversary of the Effective Date (the “Original Term”) and renew and be automatically extended for successive one-year terms (each, a “Renewal Term”) unless notice of non-renewal is given by either party to the other party at least ninety (90) days prior to the end of the Original Term or any Renewal Term.”

The first sentence of paragraph 3(a) of the Employment Agreement is amended effective as of the date hereof to read as follows:

“The Executive shall be paid a base salary at an annual rate of $1,500,000, which salary shall be earned and payable at such intervals in conformity with the Company’s prevailing practice as such practice shall be established or modified from time to time.”

Paragraph 3(b) of the Employment Agreement is amended in its entirety effective as of the date hereof to read as follows:

The last sentence of Paragraph 3(c) of the Employment Agreement is replaced in its entirety by the following two sentences effective as of the date hereof:

“To the extent that a Legacy LTIP Award (as defined in paragraph 5(a)(iii) below) otherwise provides for payment of amounts upon the occurrence of a Change in Control Event in advance of the normal payment date and without regard to a termination of employment (“LTIP Single Trigger Payment Provisions”), then, except with respect to LTIP performance periods that have ended prior to the date of the Change in Control Event (in which case this sentence shall be inapplicable), (i) the LTIP Single Trigger Payment Provisions for the Legacy LTIP Award shall be disregarded with respect to the Executive, (ii) outstanding Legacy LTIP Awards with unexpired performance periods as of the date of the Change in Control Event shall remain outstanding, (iii) the Company (or its successor) shall make equitable adjustments to the applicable performance goals for such awards, and (iv) the applicable awards shall be paid on the dates they would have been paid as provided above had no such Change in Control Event occurred, unless the Executive’s termination of employment has occurred prior to such date, in which case the amount payable with respect to such Legacy LTIP Awards shall be determined and paid in accordance paragraph 5 below. Notwithstanding the preceding provisions of this paragraph 3(c), and without limitation upon the Executive’s rights under LTIP or Incentive Plan awards granted prior to 2015, for each calendar year during the Term beginning on or after January 1, 2015, the Company shall provide the Executive with a long-term incentive award or awards under the Incentive Plan, in such form and on such terms as the Committee may determine that are no less favorable than applicable to the Company’s other

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Executive-Level Employees, in an aggregate target value on the grant date of not less than $12,000,000. For the avoidance of doubt, (x) the mix of such awards may be different for the Executive than for other Executive-Level Employees and (y) Good Reason as provided under paragraph 4(d)(i) below shall not be triggered if the Company complies with the preceding sentence. The Company shall cause the performance-vesting restricted stock unit award granted to the Executive on June 10, 2013, which is otherwise scheduled to vest on December 31, 2015 subject to performance results, to be paid to the Executive on December 31, 2015 (and included in the Executive’s taxable wages for 2015), to the extent earned based on performance and subject to the other vesting terms and conditions of such award.”

The first sentence of paragraph 3(f) of the Employment Agreement is amended effective as of the date hereof to read as follows:

“The Executive shall be reimbursed, in a manner consistent with the policies of the Company, for all reasonable business expenses incurred in the performance of Executive’s duties pursuant to this Agreement, to the extent such expenses are substantiated in writing, and are consistent with the general policies of the Company relating to the reimbursement of expenses of Executive-Level Employees of the Company.”

The following paragraph (i) is added to the end of paragraph 3 of the Employment Agreement effective as of the date hereof:

The following paragraph (j) is added to the end of paragraph 3 of the Employment Agreement effective as of the date hereof:

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“…. provided (A) the Executive is then in compliance with his ongoing obligations to the Company set forth in the Restrictive Covenant and Confidentiality Agreement referenced in paragraph 6 below, (B) the amount payable under clause (iv) for performance during 2014 or any later year shall be made at the same time other annual performance bonuses are paid to executives after a determination of performance results by the Committee (but no later than the 15th day of the third calendar month following the end of the applicable fiscal year), and (C) the amount for performance-based LTIP or other equity awards that are earned based on performance as described in clause (viii) above shall be payable at such time as provided in clause (viii).”

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“… provided, however, that (A) in case of a Termination Date that occurs during the Protected Period but before the consummation of the Change in Control Event, the amount set forth in clause (iv) above for performance during 2014 or any later year shall not be paid until the earlier of (I) within ten days following the consummation of the Change in Control Event or (II) the time when other annual performance bonuses are paid to executives after a determination of performance results by the Committee (but no later than the 15th day of the third calendar month following the end of the applicable fiscal year), (B) the amount set forth in clause (viii) above shall not be paid prior to the consummation of the Change in Control Event and shall be paid within ten days of the consummation of the Change in Control Event, and (C) the amount payable for LTIP and other equity awards under clause (ix) above shall be payable at such time as specified in the Incentive Plan and applicable award agreement. If the Change in Control Event is not consummated, the amount set forth in clause (viii) above shall not be paid and shall be forfeited.”

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The following new sentence is added at the end of paragraph 6 of the Employment Agreement as a new final sentence, which shall also be treated as an amendment to the Restrictive Covenant and Confidentiality Agreement executed by the Executive on September 27, 2012, all effective as of the date hereof:

“Notwithstanding any other provision of the Restrictive Covenant and Confidentiality Agreement to the contrary, the duration of the post-termination “Restricted Period” as defined in the first sentence of paragraph 4 of such Agreement is increased from one year to two years and the last sentence of paragraph 4 of such Agreement is deleted.”

Except as expressly or by necessary implication amended hereby, the Employment Agreement shall remain in full force and effect.

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IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first above written.

T-Mobile US, INC.

SIGNATURE PAGE FOR AMENDMENT NO. 2

TO EMPLOYMENT AGREEMENT

DATED FEBRUARY 25, 2015