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.
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