I scheduled a genius bar appointment for my iPhone. My accelerometer is defective, it doesn't rotate until you hit the phone, and I have quite a bit of dust under the screen. My phone is unlocked and jailbroken on Tmobile, and I do not have an AT&T contract anymore. I plan to restore my phone to stock tomorrow, but how do I bring it in and prove my accelerometer issue if I can't activate my phone? What are the steps I should take to get my phone replaced?