How to set up Face ID on your iPhone to increase the security of your device and data

You can set up Face ID on an iPhone in just a few seconds in the "Face ID & Passcode" section of your phone's Settings app.

How to add another person to Face ID on your iPhone

You can add another person to Face ID on your iPhone by repurposing the Alternate Appearance setting.
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iOS 12 - 2 Face IDs 1 iPhone (How to Setup Face ID for multiple people)

Finally you can setup multiple faces for Face id on one (1) iPhone X. This works with the new iOS update on any iphone that uses FaceID including the iPhone X, iPhone XS, and iPhone XR. The process is ...
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How to Use Face ID with a Mask on iPhone | New Feature | iOS 15.4 (No Apple Watch Needed!)

You can now unlock your iPhone using Face ID with a mask, and it works perfectly! This is a new feature in iPhone's latest iOS.