AT&T announced today that only customers paying for one of its Mobile Share plans will be able to use Apple's FaceTime feature over a cellular connection. The carrier touts FaceTime as "an added benefit" of its new data plans, and users with individual or family plans will have to rely on Wi-Fi connections in order to make use of the video call feature. Previously, the carrier had indicated that AT&T might charge customers extra if they wanted to use the feature over 3G.