I'm wondering if iPhone 4 will do FaceTime without cellular service using Wi-Fi only. Yes, I've seen all the threads about facetime over 3G and how to work around that, but I've got the opposite situation. My girlfriend and I just purchased Verizon iPhones, which work great here, but she's going to England for a week and won't be able to call using it. She will have wifi, so if she brings her laptop, we could do FaceTime, but she wants to leave it home and take her iPad and iPhone instead. Seems to me, rather than an AIM address, FaceTime is using the phone number to resolve who you are tring to contact. I'm afraid without access to Verizon's network, the phone won't know what to do. Any ideas? A definitive answer would be much better than finding out once she gets there. Is there something I should configure in our contact information?