How do I fix iPhone unavailable
How do I fix iPhone unavailable on a iPhone 12
iPhone 13, iOS 15
Question marked as
There is an Apple article that explains what to do if you have forgotten an iPhone or iPad passcode. Click on the following link: How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support
If that option is not available, you will need to use a computer. See: If you forgot your iPhone passcode - Apple Support