Shares of T-Mobile ( TMUS) jumped 4.71% to $25.14 after beating second quarter estimates.

The number 4 US carrier sold 4.3 million smartphones, totaling 83% of its total phone sales, up from 71% in the same quarter 2012. Revenues rose 27.5% from a year ago to $6.22 billion, beating analysts' expectations by over $200 million.

T-Mobile gained 688,000 new post-paid subscribers, nearly quadrupling Wall Street's expectations, and over 1 million total subscribers in the quarter. These results stood in sharp contrast to last year's loss of 557,000 customers. Rivals AT&T ( T) and Sprint ( S) added 550,000 subscribers and lost 1.045 million, respectively, this quarter.

"This is not a onetime blip," CEO John Legere said in a call with investors. "Customers are responding extremely well to the moves we are making."

Closing prices: TSLA jumped 14.4% to $153.48, GRPN blasted 21.6% higher to $10.60 and TMUS rose 4.1% to $25.

-- Written by Laura Berman in New York

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