How to Register Multiple Face ID Faces In iOS 12

With the release of iOS 12, Apple also upgraded the Face ID feature for the eligible iPhones, and now you can register up to two faces to unlock your device. This lets your close family members to use your iPhone as well.

Here’s how you can register multiple Face ID faces in iOS 12:
    Get to the Face ID & Passcode window
    Tap the Settings icon from the Home screen, and tap Face ID & Passcode when the Settings window opens up. This opens the Face ID & Passcode window. This is the place from where you can register one, or maximum two Face IDs.
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    Set passcode
    Tap Turn Passcode On when on the Face ID & Passcode window, enter and re-enter a complex passcode, enter your Apple ID’s password to be able to change it directly from your iPhone (optional), and tap Continue. This sets the passcode on your iPhone, and takes you back to the Face ID & Passcode window. Setting passcode is essential before you can set up Face ID. If your iPhone doesn’t have a passcode, iOS 12 would prompt you to add one at the final step of registering your face for Face ID.
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    Register first face for Face ID
    Tap Set Up Face ID on the Face ID & Passcode window, tap Get Started, move your face in circle while looking at the screen, tap Continue, move your face in circle one more time, and tap Done. This sets the first face for Face ID, and takes you back to the Face ID & Passcode window. From this point onward, you should be able to unlock your iPhone merely by looking at its screen.
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    Register a second face for Face ID

Tap Set Up an Alternate Appearance on the Face ID & Passcode window, and repeat the process explained in the previous point. This registers the second face for Face ID as well, and takes you back to the Face ID & Passcode window. From this point onward, you can unlock your iPhone using either of the two registered faces.
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Note: At the time of this writing, iOS 12 doesn’t allow you to de-register one face, and tapping the Reset Face ID option removes the records of both the faces registered for Face ID at once.
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