Enable or disable Face unlock feature on Galaxy S4
#1. On the home screen, touch the Apps menu. The Apps tab containing sub-items will then appear.
#2. From the Apps tab, locate and touch Settings. Doing so will take you to the next screen containing Connections, My Device, Accounts and More tabs.
#3. Touch My Device to get you to Personalisation sub-menu items.
#4. Locate and touch Lock screen from the available items to proceed to Screen Security.
#5. Inside Screen Security, touch Screen Lock to modify the Face Unlock feature on your device.
- After opening “Camera” app, tap on Option Key (or Menu Key which is on the left of the Home button)
- Tap on Setting
- Choose the first tab (with Camera icon)
- Make sure “Face Detection” is ON (or OFF to disable it)