T-Mobile announced a nice 2.1 million new customers in the last quarter, rounding out the best year for the U.S. carrier, but it isn't the only carrier adding customers.

Sprint also announced 967,000 new customers in the end of the fourth quarter, just shy of 1 million, and enough to keep Sprint in third place against T-Mobile.

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The added customers are bundled, meaning Sprint takes post-paid, pre-paid and wholesale buyers. Sprint added 30,000, 410,000 and 527,000 customers, respectively from each. Sprint also takes numbers from Boost, Virgin Mobile, FreedomPop, Ting and Republic Wireless its subsidiaries.

Its clear Sprint is still struggling against the two big U.S. carriers and T-Mobile, but adding the new CEO Marcelo Claure and finding more funding from its new owners, SoftBank has made it easier for Sprint to take financial risks to secure more customers.

Some of these new ideas include cutting new customer bills by 50 percent, though it has been noted deals will only save new customers around 20 percent at most.

It is questionable how much these deals are working to Sprint's advantage, considering only half a million bought into new contracts, while T-Mobile is getting millions of customers to sign contracts every quarter.

Sprint has also got one of the worst reputations in the industry for customer support, coming last in the U.S. carrier battle this year. In almost every poll to do with support, Sprint has came last or close to last.

This is a terrible statistic, because even if Sprint want to win over the customer with excellent pricing, nobody will want to move to the carrier unless they fix customer support.

2015 is going to be hard for the third place carrier, as they try to stay relevant against a very aggressive T-Mobile and two unstoppable U.S. carriers, owning more than double the subscribers each.

TagsSprint, U.S. carriers, mobile contracts