T-Mobile revealed impressive figures for 2014, showing that the company has plenty of reason to think its brash, maverick style of marketing is working.

T-Mobile revealed last week that it added 8.3 million customers overall during 2014. In addition, the company reports 4.9 million branded postpaid net customer additions and 4 million branded postpaid phone net customer additions. T-Mobile's network also expanded in 2014 to cover 265 million Americans.

"While my competitors are hiding behind less valuable connected device subscriber additions and managing profit expectations to the downside, T-Mobile delivered over 2.1 million customers in Q4, while managing the balance between growth and profitability," said T-Mobile's eccentric president and CEO John Legere. "Needless to say, 2014 was a record breaking year."

T-Mobile managed 1.3 million branded postpaid net customer additions and 1 million branded postpaid phone net customer additions during the fourth quarter of 2014. The fourth quarter figures mark the seventh straight quarter that T-Mobile has added more than 1 million customers.

"We are not slowing down, and customers know it. Just a few weeks ago we unveiled Un-carrier 8.0, introducing Data Stash with 10GB free LTE data to qualifying Simple Choice customers," continued Legere. "Now we are the only national provider to let you roll over your unused high-speed data. Clearly customers are seeing through the tricks and the confusion that the other guys offer and coming to T-Mobile for our solutions."

With those kinds of figures, T-Mobile might actually live up to some of its CEO's lofty expectations in 2015.

"T-Mobile will -- officially -- become the No. 3 wireless company in America in 2015. This summer, I said we'd blow by Sprint by the end of 2014 to become the No. 3 wireless company in the U.S.," Legere wrote in a blog post outlining his expectations for 2015. "They have been swinging the bat since I made that statement, so we won't know where things stand until we get the final score after we both report Q4 earnings, but whether it is now -- or soon -- I'm telling you, it's a done deal!"

T-Mobile has enjoyed recent success largely in part due to its Un-carrier strategies. Unconvential, and many other things "un," Un-carrier moves include doing away with contracts, offering customers upgrades sooner, scrapping international data roaming charges, a free music streaming service, and more. The latest move allows T-Mobile subscribers to roll over unused data to the next month.

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