[Melech518]

Even if your used craigslist phone is under warranty there could still be factors which would void that. Check the water damage indicators....

[redsox786]

So I traded my dinged up iPhone that I purchased from craigslist to a friend for a like-new iPhone. Cosmetically, it looks fine. However, I just discovered today that the GPS does not work. I've tried restoring it but the phone can never pick up a GPS signal. It is still jailbroken and unlocked, but the warranty ends mid-September. Would I be able to get a new iPhone from the Apple store? Would I have to restore it and then take it without my sim card? Please help!

P.S. I'm thinking about just calling Apple Support. Will they ask me for my phone number to verify a AT&T account? I do have a spare AT&T sim card from the previous owner but I think it's inactive. The owner still has the same number just a different sim card.

EDIT: Went to the Apple Store, but said they needed a AT&T sim card in the phone in order to "diagnose" the GPS. The AT&T sim card that I have is inactive. Any suggestions?