What can do to my iPhone unavailable

If you forgot the passcode on your iPhone, or your iPhone is disabled or unavailable -

Click on the link for instructions on how to reset your passcode without a computer if you have iOS 15.2 or higher.

How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support

Click on the link for instructions on how to reset your passcode using a computer.

If you forgot your iPhone passcode - Apple Support If you forgot your iPhone passcode - Apple Support

Follow the steps here to restore your device and set it up again: click here ➜  if you see "[Device] unavailable" or "Security Lockout" on your iPhone or iPad - Apple Support

You need to restore it through your computer and then reload your most recent backup.