T-Mobile US (TMUS) 8-K MetroPCS Wireless, Inc. Announces Commencement of a Notes Offering for $500

Exhibit 12.1

CALCULATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended December 31,															Nine Months Ended September 30,
	2005			2006			2007			2008			2009			2009			2010
	(dollars in thousands)
Earnings available for fixed charges:
Income before income taxes	$	326,102		$	90,523		$	223,501		$	279,424		$	263,679		$	204,995		$	297,234
Fixed charges		114,965			202,074			290,209			309,033			401,319			297,640			295,206
Amortization of capitalized interest		408			843			2,388			6,041			9,920			7,237			8,604
Capitalized interest		(3,564	)		(17,503	)		(34,867	)		(64,160	)		(37,495	)		(30,549	)		(17,822	)
Total earnings available for fixed charges:	$	437,911		$	275,937		$	481,231		$	530,338		$	637,423		$	479,323		$	583,222
Fixed charges:
Interest expense (1)	$	58,033		$	115,985		$	201,746		$	179,398		$	270,285		$	199,358		$	198,710
Portion of rent expense representative of interest (2)		17,202			28,199			41,392			65,475			93,539			67,733			78,674
Capitalized interest		3,564			17,503			34,867			64,160			37,495			30,549			17,822
Net preferred stock dividends (3)		36,166			40,387			12,204			—			—			—			—
Total fixed charges:	$	114,965		$	202,074		$	290,209		$	309,033		$	401,319		$	297,640		$	295,206
Ratio of earnings to fixed charges:		3.81x			1.37x			1.66x			1.72x			1.59x			1.61x			1.98x

(1) Interest expense includes amortization of deferred debt issuance costs and premiums and discounts related to indebtedness.

(2) The portion of operating rent al expense that management believes is representative of interest is estimated to be 33%.

(3) Net preferred stock dividends are the company’s preferred dividend expense net of income tax benefit.