My daughters iPhone screen is broke. We have gotten her a new phone and were thinking of selling her old phone. The phone turns on but you cannot see the screen. Is there any way to reset the phone before selling?
Settings> general>reset >erase all content and settings. It will go back to the initial Apple defaults. If you cannot see anything on the screen, book the iPhone up to itunes and perform a restore then setup as new.
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Information on iPhone unlocking can be found here by copying this link into your browser: https://www.att.com/deviceunlock/client/en_US/