I bought my iPhone 4 off ebay about six months ago, and after registering it under my appleid on apple's "my profiles" or what it's called, I see that it is under warranty until this coming october. The battery is (at least in my opinion), fairly bad, and either way I would like to get a new one before the warranty is up. I currently have it jailbroken and unlocked to use on T-Mobile and I'm not sure how to go about getting a new one. Obviously I would restore my phone to stock iOS when I bring it in, but will I have any problems getting a new one given my situation? I'm just wondering because I'm not the original owner, and I don't know if they'd give me a hard time because I'm not an AT&T customer. Anyone know how I should go about doing this?