The times, they are a’changing. Following close on the heels of both Verizon and Sprint, AT&T has just announced that they will be offering an unlimited calling option in short order. Insofar as we can tell, the $99 plan offers unlimited voice minutes, but everything else, including SMS and data use, will cost you. As an added caveat, it will only be available to dumb phone users when it drops on the 22nd of February, so all you PDA/Smartphone guys can seek elsewhere. That said, unlimited voice is a good thing. Any bets on how long it’s going to take T-mobile to join in the fun?