AT&T plans to acquire T-Mobile USA in a cash-and-stock deal valued at $39 billion. It would become the largest U.S. cellphone company. Seth Perlman and Roberto Pfeil/AP hide caption itoggle caption Seth Perlman and Roberto Pfeil/AP The Two-Way AT&T Plan To Buy T-Mobile: Good And Bad News For Consumers? March 21, 2011 Quality and coverage might improve, but will costs come down as much as they might have otherwise? Meanwhile, stock markets seem to like the news.