Recently I've received an iPhone 4 from my daughter and she told me that it was working on ATT with no issues but she wanted to have it unlocked in order to use it on another carrier. I went into ATT and requested to have he phone unlocked. Suddenly after the restore finished as instructed by ATT the phone no longer has service. I've contacted ATT and APPLE and they both are telling me that the phone has hardware issue. I still do not believe them and performed multiple searches on the web and realized that I've have not been the only to have this issue. Has any other of you guys experienced this or have found a way to fix this. I've tried restores, reset , new sim cards , etc , etc with no luck. Any suggetions will be really appreciated.