4 digit passcode reset
I guess I forgot my 4-digit passcode. How do I reset it?
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If you forgot a passcode that you changed within the last 72 hours, see the following for instructions: Temporarily use your old passcode when you forget your new passcode on iPhone or iPad - Apple Support
Otherwise, there is an Apple article that explains what to do if you have forgotten an iPhone or iPad passcode. Click on the following link: If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support
If that is not an option, you will need to use a computer. See:
If you forgot your iPhone passcode - Apple Support
or
If you forgot your iPad passcode - Apple Support