It may not be all that shocking from a common sense point of view, but AT&T CEO Randall Stephenson's statement that "there will be a day when you are not exclusive with the iPhone" is still quite a departure from anything he's said in the past and, given the stakes involved, pretty darn notable. That word came at Fortune's now happening Brainstorm: Tech conference, where Stephenson unsurprisingly didn't elaborate on any negotiations with Apple, and only went so far as to say that he thinks AT&T's partnership with Apple "works really, really well -- maybe as well as any strategic partnership we have." Of course, none of that means exclusivity is going away anytime soon, and you can pretty safely bet that AT&T will keep on pushing as long as it can.