New phone
My boyfriends grandma got a new iPhone and we can’t erase the guys stuff because we don’t have his password for his Apple ID so the phone is in security lockout
iPhone 13 Pro
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Then the iPhone grandma got isn't new. Otherwise, no one else's credentials would have already been on it.
You're going to have to get the ID and password from the "guy" this phone used to belong to, or it will be forever useless.