Seems rather unfair, but AT&T could start charging extra for FaceTime over 3G/4G. What makes this unfair is that FaceTime is nothing but data transfer, which we are already paying for. Our data is no longer unlimited, and it only seems fair that we do as we please with it. Regardless of what app or service it may be.

AT&T Could Begin Charging iPhone Users Extra For Video Chat – Same For Android Users?

And as Chris Chavez mentions, if AT&T is down to do this, they might be wanting to do the same to Android users. Though I think that would be harder to do, due to Android's nature, but what is stopping them from trying? Not cool, we are going back to BlackBerry times...