iphone unavailable

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

How to reset your passcode without a computer if you have iOS 15.2 or higher.

How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support

How to reset your passcode using a computer.

If you forgot your iPhone passcode - Apple Support

Hi!

If you have entered your iPhone's Lock Screen passcode incorrectly multiple times, your iPhone will become disabled, or unavailable for a growing prolonged period of time, should you continue entering the wrong password. If you do this too many times, your iPhone will become premaritally locked, meaning you cannot access any of the data, also requiring you to reset it to factory defaults.