Set up Face ID on iPhone - Apple Support

Use Face ID to unlock iPhone, authorize purchases and payments, and sign in to many third-party apps.

Set up your iPhone or iPad - Apple Support

Use a passcode with your iPhone, iPad, or iPod touch - Apple-support (SE)

If Face ID isn't working - Apple Support

How to Set Up and Use Face ID on Your iPhone

iPhone 15/15 Pro Max: How to Enable/Disable Use Face ID for Wallet & Apple Pay

Use the Messages app - Apple Support

Wake and unlock iPhone - Apple Support

Set up Assistive Access on iPhone - Apple Support

iPhone 13/13 Pro: How to Setup Face ID

Set up Apple Pay - Apple Support

View Live Activities in the Dynamic Island on iPhone - Apple Support