T-Mobile US Inc

T-Mobile is the second-largest wireless carrier in the US, serving roughly 86 million postpaid and 26 million prepaid phone customers — about 30% of the retail wireless market. Revenue comes primarily from monthly subscriber fees. Beyond phones, it has built a meaningful fixed-wireless broadband business with 8 million home and business internet customers, plus about 1 million fiber customers through joint ventures with fiber network operators. It also earns wholesale revenue by selling network access to smaller wireless resellers.