AT&T to Buy T-Mobile USA for $39 Billion AT&T to Buy T-Mobile USA for $39 Billion Source: dealbook.nytimes.com AT&T announced on Sunday that it has agreed to buy T-Mobile USA from Deutsche Telekom for $39 billion, in one of the biggest mergers since the onset of the financial crisis. Â Â Â Â WTF…….after all this time…..and that too AT&T. Ouch !! Â Â Â Â By arZan ... View all of arZan's posts.