How do I unlock my iPhone 12

Hey there,

How is it locked?

if you forget the passcode for your iPhone:

If your iPhone or iPad has iOS 15.2 or later installed, see: How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support

If that option is not available, you will need to use a computer. See: If you forgot your iPhone passcode - Apple Support

if your iPhone is locked by activation lock See :

How to remove Activation Lock - Apple Support

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Activation Lock for iPhone, iPad, and iPod touch - Apple Support