screen password lock
How to unlock my screen password?
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The same passcode that is used to start the phone is used to “unlock” the screen.
If you can’t remember the passcode, your ONLY option is to completely erase the phone and restore from a backup as described here:
If you see an iPhone or iPad unavailable message or Security Lockout screen – Apple Support (AU)
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If you actually meant your ScreenTime passcode … see this article:
If you forgot your Screen Time passcode - Apple Support