If you've already set up
Face Unlock but your phone won't unlock, check the following:
Make sure the front camera is not covered by your protective case.
Make sure you're on the lock screen and not on the
Smart display when you're unlocking the phone with
Move to a well-lit location.
Remove your sunglasses or other things that cover your eyes.
Face Unlock got disabled because you activated a device administrator app, such as Exchange
ActiveSync® security policies after signing in to your Exchange
ActiveSync mail account.
For added protection,
Face Unlock allows up to 5 unsuccessful attempts. If you exceed this, you'll be required to use one of the screen lock options—screen lock PIN, password, or pattern—to unlock your phone.
If you haven't used
Face Unlock to unlock your phone for the past 72 hours, you'll be required to use one of the screen lock options to unlock your phone.
Face Unlock may not recognize you if you have slight facial changes, for instance, due to mustache growth, suntan, or surgery. Go to
to register your face data again.