Well I just thought i would register on these forums to let you all know about my experience... First of all I live in Windsor ontario canada, I bought my iphone from an AT&T store in Detroit MI. took it home and unlocked it and it was all good. Until one day my phone started loading to the apple screen and then restarting. I was able to restore it and get it unlocked and jailbroken again. however since then every time i turn on my wifi it crashes my phone. Unable to call apple for support not living in the USA I was forced to go into the store armed with a good story about how I used the phone as a PDA because we are unable to activate it in Canada. All was going well until the mac genius took my phone in the back to match it up with the numbers they had with AT&T, obviously they did not match and i was told be on my way... From this experience i can pass this info to everyone here. If you are going to jail break or hack your phone in anyway and want to have a warranty then you MUST have an AT&T account! Apple will not repair anything no matter what is issue is unless you have your AT&T sim card with you. If your phone fails on you and you are with AT&T just restore and you are good to go. sorry if most of you already knew this but after a quick search on this forum there was some grey area when it came to warranty coverage. P.S. if anyone knows what I can do about my wifi issue that would be very much appreciated.