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The wireless carrier expects the momentum to continue into 2015, but it will have to reckon with the costs of its Data Stash program.
A fourth-quarter jump in the customer turnover rate underscores the increasingly volatile environment for wireless carriers that even Verizon can no longer avoid.
First quarter for new CEO Marcelo Claure was a rocky one, with growth largely driven by the carrier's wholesale business, but there were signs of progress.
The carrier managed to pull in even more customers than Wall Street anticipated -- despite high expectations -- but losses also widened.
T-Mobile's customer base surpassed the 50 million mark as aggressive promotions once again stoked growth. Its profit was helped by a gain from a spectrum licensing deal.
The company adds 1.15 million new tablets in the period, offsetting a slowdown in smartphone growth.
The carrier added 2.4 million wireless customers, the first time it's topped the 2 million mark. But growth didn't come cheap.
While its subscriber growth was impressive, the company posted a loss. CNET digs into the numbers and explains why T-Mobile is still feeling upbeat.
The carrier, meanwhile, says it's brought LTE to 41 more cities, and its Sprint Spark enhanced network to another six cities, as it trudges through its painful network upgrade.