Resetting iPhone with mother-in-law's Face ID
I need to reset my iPhone that my mother in law had but gave it back to me but Face ID still on
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That may not be the only problem you'll encounter if the phone wasn't prepared properly for a new owner. Get the previous owner to do the things in this article (including disabling Stolen Device Protection): What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support