Hi - I know jailbreaking voids the warranty on the iPhone and I know restoring it will set it back to factory. I have a jailbroken iPhone 3GS that I received after trading a N900. There is a one month Applecare warranty left on this Phone. My question is if I purchase a Applecare box though the Apple site or eBay, will I be able to register and extend the warranty of this phone? If so, how does this work, I've never done it before, will the Phone need to be on the AT&T network in order for this to complete? I have it on T-Mobile right now. I wasn't sure if I need to connect the Phone and do something, never purchased Applecare before. Plus when registering for it, can I just place my contact details on the registration. Thanks!