How can I unlock iPhone 13 without a computer that is locked disabled itunes

Hey there,

If your iPhone or iPad has iOS 15.2 or later installed you can reset it without computer , see: How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support

If your phone is not installed on iOS 15.2 or later , you will need a a computer!

Have it fixed at an Apple Store or Apple Authorized Service provider or use a friend's computer.

If you forgot your iPhone passcode - Apple Support

If you want to go the Apple Store or AASP router click on the Get Support link at the top right of this page.