AT&T's $39 billion bid for T-Mobile this weekend wasn't just a surprise to the general public. Sprint CEO Dan Hesse was also "shocked" to find out about it. "That one was not on the radar screen," he tells CNBC's Jim Cramer in an interview today ( transcript ). He didn't think it would be possible because of antitrust issues, and he is definitely playing up those issues now. Hesse doesn't like the deal one bit because it will make Sprint a distant third after AT&T and Verizon in the U.S. mobile market. (A combined AT&T-T-Mobile will have more than 100 million subscribers, as does Verizon already, while Sprint is half that size with 50 million). He's already threatening to complain to Congress, and he's practicing his arguments on TV. He warns Cramer of a duopoly situation: