I forgot my passcode
I changed my passcode, but have forgotten it. I am locked out to where it says "Iphone unavailable". How do I get in?
iPhone 12, iOS 15
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The ONLY option now it to completely reset (erase) the phone and restore from a backup.
Knowledge of the AppleID and password is required; as is another trusted device (on the same AppleID) or else access to a trusted number to receive the 2FA Verification Code.
How to reset your iPhone, iPad or iPod touch if you've forgotten your passcode – Apple Support (AU)
Note that if the iOS is prior to 15.2, a computer and a cable will ADDITIONALLY be required to perform the steps linked near the end of the article.