My wife and I upgraded to the 4G phones yesterday and messed around with FaceTime in the house on the same network. Worked like a charm as you'd pretty much expect. Today she took my kids to karate class in an area that is notorious for bad cell coverage--she tried calling me 3 or 4 times and we'd lose the connection each time--very frustrating and I was about to just say "forget it, talk to me when you're on the road" when I remembered about FaceTime. Since the karate school has WiFi for the parents when their kids are in class, I had her put the phone on speaker (which actually sounds fantastic by the way) and helped her get connected to the network. As soon as she was connected, I hit the FaceTime button under her contact and within 10 seconds we were connected. It was very cool and being able to talk to her without constant dropped calls was awesome. She even flipped to the other camera to show me what the kids were doing (as well as the fat guy chewing his gum like a cow It was very, very cool. Almost no lag and the noise reduction mic did a really great job on the call--it far surpassed my expectations.