Deutsche Telekom merged its T-Mobile USA unit with prepaid specialist MetroPCS in 2013, and that firm merged with Sprint in 2020, creating the second-largest wireless carrier in the us T-Mobile now serves 77 million postpaid and 21 millionprepaid phone customers, equal to around 30% of the us retail wireless market. The firm entered the fixed-wireless broadband market aggressively in 2021 and now serves more than 5 million residential and business customers. In addition, T-Mobile provides wholesale services to resellers.