Notes
I need help with my notes I forgot my password
iPhone 11, iOS 15
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See the article How to lock or unlock notes on your iPhone, iPad, and iPod touch - Apple Support
Don't forget your Notes password. Apple doesn't have access to locked notes and can’t help you access them if you forget your password. If you forget your Notes password, resetting the password doesn’t give you access to previously locked notes. Resetting then creating a new Notes password only allows you to lock other notes.