Smartphone Questions? Ask A Smartphone Technician for Answers
As you may already know, you will need them to log in to use the phone. The good news is that even though they can't remember their password, they can reset it.
Please have your friend go here: https://iforgot.apple.com/password/verify/appleid
Enter their Apple ID information and follow the prompts to reset their password. Use the new information on the iPhone 5 to remove the lock.
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