My passcode keeps not working on my iPhone and locks me out
Passcode continues to not work when entered and locks me out
iPhone XR, iOS 15
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Turn off Raise to Wake in Settings, Display & Brightness and turn off Tap to Wake in Settings, Accessibility, Touch to prevent it opening in your pocket or purse
You can sometimes remedy this without a computer if on iOS 15.2 or later by tapping on "erase iPhone" , but you will still need the Apple ID password. It will WIPE the phone, no choice!
How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support
video
ios 15.1 and earlier:
If you've forgotten your iPhone passcode – Apple Support (UK)