Settings : Security : Lock and unlock phone
Fix an issue
If you're having trouble getting the phone to recognize your face:
1.
Go to
Settings
> Security > Face Unlock.
2.
Unlock your phone, then tap Delete face data.
3.
Be sure you are in a well lit environment. Avoid low light, strong light, and backlit environments to
ensure the face image is clear.
4.
Tap Set up Face Unlock and follow onscreen instructions to set it up again.
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