If Face ID doesn't appear to be working on your Apple device, start by making sure it's enabled in Settings for any features you want it to unlock.

Apple's Face ID is one of those features you don't fully appreciate until it stops working. When it's behaving, it feels effortless; you glance at your iPhone and it's instantly unlocked. But when ...

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.