AT&T has limited the access of the iPhone's FaceTime functionality to Mobile Share plan customers and LTE device users. So when the carrier announced that it would soon allow first-party video chat apps to operate on its wide network, AT&T customers were excited.
Now it seems that AT&T has started deploying the feature to a few parts in the U.S. Although AT&T has not confirmed the roll-out, a few customers from Maryland, New York, Georgia, Louisiana, California, and Hawaii are reporting activations of FaceTime via cellular.
Apple Insider says that even those with grandfathered unlimited data plans are beginning to experience the nifty feature.
Source: Apple Insider