how to disable without using iTunes?
How do I unlock phone that's disabled without using iTunes?
iPhone 11
Question marked as
A Mac or Windows is required. Whether yours or borrowed. If that is not an option here, contact Apple or an Apple authorized reseller, and request assistance.
If you have iOS 15.2 or later, and an erase option is being shown, you can use that:
… How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support
Otherwise, you will need a computer, or will need assistance, to perform the reset.