The FCC halted its informal 180-day review "shot clock" of AT&T's (NYSE:T) proposed $39 billion acquisition of T-Mobile USA because AT&T recently submitted new economic models on which it is basing its case for the deal. In a letter to AT&T's outside counsel, Rick Kaplan, chief of the FCC's wireless telecommunications bureau, said that the new analysis will not be available to the FCC to review until July 25. Kaplan said the clock has stopped because the FCC needs time to look at the evidence and allow third parties to have an opportunity to provide feedback on the new models. The review clock will start up again after the FCC and third parties evaluate the new material and third parties have an opportunity to comment on it, Kaplan wrote. The FCC announcement came out the same day Sen. Herb Kohl (D., Wis.), chairman of a Senate Judiciary Committee's antitrust subcommittee, formally objected to the deal in a letter to Attorney General Eric Holder and FCC Chairman Julius Genachowski. A decision on final regulatory approval of the deal is not expected until the first quarter of next year. Article