Samsung Galaxy S III - Owner Information; Security; Encrypt Device

Changing Your Settings 363
Using Face Unlock
This feature used facial recognition to unlock your phone. This
feature is less secure than PIN, Pattern, and Password locks and can
be bypassed by someone else who looks similar to you.
1. From the main
Settings page, tap Lock screen .
2. Tap
Screen lock ➔ Face unlock .
3. Read the on-screen notification and tap
Set it up .
4. Follow the on-screen instructions.
Using Face and Voice Unlock
This feature used facial recognition to unlock your phone. This
feature is less secure than PIN, Pattern, and Password locks and can
be bypassed by someone else who looks similar to you.
1. From the main
Settings page, tap Lock screen .
2. Tap
Screen lock ➔ Face and voice .
3. Read the on-screen notification and tap
Set it up .
4. Follow the on-screen instructions.
5. Once prompted to speak and unlock command, tap
and repeat the phrase four times.
6. Once complete, tap
Done .