Beginning in iOS 6, you'll be able to use FaceTime over cellular networks. This feature was announced during the WWDC 2012 keynote and is a big deal because it means you can FaceTime with anyone, as long as you have a cell signal. You can be out and about getting your video chat on, and this will bring FaceTime out from the occassional use category and into something that may actually prove to be very useful.
Since the introduction of FaceTime, users have been clamoring for a time when the technology would work over 3G. Since the debut of FaceTime as the major feature of the iPhone 4, it's been relegated to Wi-Fi-only staus, which meant that many on-the-go users never used it. However, a recent error message found by iDevice displays the message "Disabling 3G may end FaceTime."
With the next iPhone rumored to be LTE-enabled, it isn't hard to believe that FaceTime over 3G and/or LTE will be a feature of iOS 6. When FaceTime was first introduced, Steve Jobs noted that Apple needed "to work a little bit with the cellular providers to get [FaceTime] ready for the future."
Read More | iDevice