Well I tried searching but had no luck finding an answer for my problem. I have an AT&T iPhone 4 and I attempted to replace the screen myself. All went well for the most part but apparently I got a defective screen and lost a couple screws. Also I had no/very weak service. I called one of the many iPhone 'professionals' to fix my mistake. So they just replaced the screen and lost screws and I still have no service. The guy told me I'm sol and he won't fix it.. pretty much. So I put a new wifi/speaker assembly in with no change. Just wondering what the other possabilities are. I noticed they did not put one of the 4 corner band screws in. The one next to the camera to be exact. He assured me it wasn't that though. Everything on the phone works as it should. I just get no service and wifi will connect and show full strength but with safari open it will not load anything. Any help is greatly appreciated!!!