Just a week after T-Mobile announced strong second quarter results, exceeding Wall Street’s expectations, the company announced that it’s become the top prepaid wireless service provider in the US with 15.6 million customers. Sprint, which is now number two in prepaid, has a total of 15.2 million customers, while AT&T and Verizon have got 11.3 million and 6 million prepaid users, respectively. The number reported by T-Mobile includes customers from the company’s prepaid arm as well as from MetroPCS, which they acquired last year. T-Mobile said MetroPCS added 1.2 million customers since this time last year, which is effectively one customer every 27 seconds, and now has a total of over 10 million prepaid subscribers.