In spite of earlier statements by the carrier, AT&T appears to be extending cellular FaceTime to all compatible devices on its network, note forum posters at MacRumors. It had been announced that while cellular FaceTime would no longer be restricted to Mobile Share plans, the option would still require a tiered data plan and a device with LTE. By definition that would block the iPhone 4S and/or anyone on a grandfathered unlimited plan; anything earlier than the 4S is unsupported because of Apple's own restrictions in iOS 6.
