iPhone 4 users can make FaceTime calls by clicking "FaceTime" on their contact's page (left); you can also switch a voice call into a FaceTime call while a call is in progress (right)
FaceTime is one of the new and highly-anticipated features included on Apple’s iPhone 4 that allows iPhone 4 users to video chat with other iPhone 4 users over WiFi. There are definitely a lot of great potential uses for FaceTime, and Apple makes it very easy to use. The only downfall to FaceTime is that it only works over WiFi - you CANNOT use Facetime while your phone is connected to AT&T's 3G network. This isn't an issue if you want to make video calls at home or at the office where you have a WiFi network set up, but what about folks who want to use it while traveling? Here at EVDOinfo/3Gstore, we understand that people want to be mobile with their mobile devices, and we have a number of solutions that allow you to use FaceTime while you're on the go!
Read our recommendations for mobile WiFi for FaceTime and watch our video demonstrating using Sprint 4G: Using Mobile 3G/4G WiFi for iPhone 4 FaceTime Video Calls