updated 03:21 pm EDT, Thu September 13, 2012
Counters ATT push for more expensive plans
(Updated with news of device support) Sprint and Verizon are repeating earlier statements that unlike AT&T, their subscribers will be able to use FaceTime over cellular without upgrading plans. AT&T is forcing users to move to more expensive shared data plans if they want 3G/4G FaceTime, in spite of similar apps being unrestricted. The difference may be that FaceTime is integrated into iOS, making it more easy to access and thus more likely to consume bandwidth.
Update: AT&T and Verizon have added that FaceTime over cellular will be supported for any device Apple has enabled with the technology. That means that the iPhone 4S and third-generation iPad should be supported as well, not just the iPhone 5. The option is a part of iOS 6, which will go live on September 19th.