I got a G1 about 2 months ago and I need help unlocking it over to AT&T. I bought it from some guy on Craigslist so when I got home, I called T-Mobile to see if they could send an unlock code. While I waited, I just went ahead and bought off some site...unlocking.com or something...so now I have the code. Only problem is that the phone says that it cannot be unlocked. Now I am trying to unlock it for AT&T for my dad although its a surprise and he's not in town so I need to unlock it WITHOUT his SIM card so that it can be ready when he comes back. Is there any way to do this? I have an old Boost Mobile SIM card lying around. When I did try to unlock it with a friend's AT&T SIM card, it said something about "service unavailable" or something too. I searched online and found to get an app called "SGS Unlock" or something like that and it will provide an unlock code and such...when I boot on the phone, it stays on the "Insert SIM card" screen and cannot go to the regular Android OS screen. It does ask if I would like to add a Gmail account which I tried doing but it keeps saying that the network is unavailable. And of course I can make emergency calls. Any help out there??