How to unlock iphone 12 disabled to connect itunes?

You will need to restore the device using a computer. The process will erase the device. Later you can restore your data from a recent back-up. Instructions here…

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

Turn the phone off before connecting to a computer and use the following instructions: If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support