T-Mobile US Inc (NYSE:TMUS) released its fourth quarter and full year earnings report this morning before opening bell, posting revenue of $6.83 billion for the December quarter. Analysts had been expecting the mobile carrier to report revenue of $6.94 billion.

T-Mobile

Breaking down T-Mobile’s quarterly results

During the fourth quarter, T-Mobile US Inc (NYSE:TMUS) added 1.6 million net customers. That includes 981,000 total branded net customer additions with 869,000 branded postpaid net additions. T-Mobile said that’s the best branded postpaid performance in its history. The mobile carrier also reported 112,000 net customer prepaid additions and a lo1 1.7% branded postpaid churn, which is flat sequentially. T-Mobile ended the quarter with about 46.7 million customers, an increase of 1.645 million from the previous quarter.

For the fourth quarter, T-Mobile US Inc (NYSE:TMUS) reported adjusted EBITDA of $1.239 billion and a 24% adjusted EBITDA margin. Total revenues rose 39.1% year over year, mostly due to the acquisition of MetroPCS. T-Mobile also sold a record number of smartphones during the fourth quarter, amounting to 6.2 million units. Fourth quarter service revenues rose 25.2% because of the MetroPCS acquisition.

Examining T-Mobile’s full year results

For the full year, T-Mobile US Inc (NYSE:TMUS) reported more than 4.4 million total net customer additions on a pro forma combined basis. That includes 2.4 million total branded net customer additions with a 1.7% postpaid churn rate.

The mobile carrier had an adjusted EBITDA of $5.317 billion and a 26% adjusted EBITDA margin on a pro forma combined basis. Overall quarterly losses were $20 million

T-Mobile provides other updates

Last month, T-Mobile US Inc (NYSE:TMUS) entered into agreements to buy some 700 MHz A-block spectrum licenses from Verizon Wireless for about $2.4 billion in cash and the transfer of some AWS and PCS spectrum.

The carrier also reports that it now covers 209 million in 273 metropolitan areas with 4G LTE service. It guided for full-year adjusted EBITDA to be between $5.7 billion and $6 billion for 2014.