Follow these steps before you take your device to an Apple Store, Apple Authorized Service Provider, or carrier. If your device won't turn on or respond, finish as many steps as possible:
If you haven't already, call to check whether you need an appointment before you go to a service location. For example, schedule a Genius Bar reservation before you go to an Apple Store. When you go, remember to bring these items:
* If you're unable to turn off Find My iPhone, Apple might not be able to service your device. This policy is in force to prevent unauthorized persons from servicing your device without your knowledge. If you don't remember your Apple ID and Password, please go to iForgot.