In just around three weeks since it became available, T-Mobile already sold half a million iPhones. Given the fact that T-Mobile is the smallest of the big four US carriers and the fact that the iPhone only launched on April 12, that’s a pretty impressive number.
We have heard T-Mobile blame the lack of iPhone for bleeding customers in previous financial recaps so this will definitely help. Moreover, getting the iPhone on the carrier is quite a deal right now as it costs much less compared to other carriers that tie you into a two-year agreement.
source: T-Mobile via Business Insider