Many signs point to the Apple and ATT agreement that makes the latter the exclusive carrier of the iPhone within the US coming to an end within the next year. For starters, non-exclusivity has been profitable for Apple in others part of the world.Moreover, even ATT’s CEO acknowledges the deal won’t last forever. And while Verizon might be all about showing off what Droid does right now, a new report suggests it could become the first carrier other than ATT to offer iPhone on American soil, start