I've never jailbroken or unlocked my phone. I've had it for 2 years now and it quit getting any cell signal last Thursday for no apparent reason. I can't make or receive calls. Text doesn't work either, but Wifi works and all other apps work. I've reset and restored the phone. It's still not working. I've called AT&T and they had me test out the SIM card on my old phone. It works on the old phone, so it's not the SIM card. They told me to take the phone in to a genius bar but the nearest apple store is 2 hours away from me and I won't be able to go for a couple of weeks. Anybody have any idea what could be wrong with it? Is there anything I can try in the meantime? Thanks.