I wanted to try out tethering solutions from Sprint, Verizon Wireless, and AT&T to see how well the carrier’s respective networks would be able to perform with Apple’s WiFi only FaceTime video chat on the iPhone 4. Connecting to Sprint’s MiFi on the carrier’s 3G network, FaceTime seems choppy and audio and video were out of sync. On Verizon Wireless when tethered to the carrier’s 3G mobile broadband through the Motorola Droid X, we had the same experience of out of sync video and choppy performance. However, when we tethered the iPhone 4 over WiFi to utilize Apple’s iPad 3G that’s been jailbroken on AT&T’s 3G network, performance is very usable, showing that AT&T’s 3G network could very well be capable of handling FaceTime video calls, though with the new finite data plans, we wouldn’t want to exhaust data limitations.