T-Mobile USA added 8.3 million customers last year, including 2.1 million in the fourth quarter, solidifying its position as the country’s number three wireless carrier ahead of Sprint and behind Verizon Wireless and AT&T. T-Mobile had 63.3 million customers as of December 31, 2015, up from 55 million customers at the end of 2014, the company announced today in a preliminary earnings report. In total, T-Mobile now has 29.4 million postpaid phone customers, 2.3 million postpaid mobile broadband customers, 17.6 million prepaid customers, and 14 million wholesale customers. This was the second consecutive year that T-Mobile boosted its customer total by more than 8 million. (credit: T-Mobile) T-Mobile has also improved its churn rate—the percentage of subscribers who discontinued service—meaning that fewer customers are leaving for other carriers. Read 2 remaining paragraphs | Comments