T-Mobile US (TMUS) 10-K 2011 FY Annual report

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of MetroPCS Communications, Inc. (the “Company”) on Form 10-K for the period ending December 31, 2011 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, J. Braxton Carter, Chief Financial Officer and Vice Chairman of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Report.

Date: February 29, 2012

By:	/s/  J. Braxton Carter
J. Braxton Carter
Chief Financial Officer and Vice Chairman

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by Company and furnished to the Securities and Exchange Commission or its staff upon request.