To help the device recognize your face, you can capture your face in different conditions. For example, you can capture your face in different lighting, with or without prescription glasses or sunglasses, or with a bearded or clean-shaven face.
To capture additional faces:
1. From the Home screen, touch Menu key > Settings > My Device Tab > Lock screen > Improve facial recognition. For an older device, touch Menu > Settings > Lock screen > Improve facial recognition.
2. Confirm your Pattern or PIN lock to continue.
3. Hold the device at eye level and touch Continue.
4. Center your face inside the dotted line. When the device is able to recognize your face, Face captured is displayed.
5. Touch Done.
Repeat the steps to capture your face in different conditions.