

In addition, Android also has a software-based face unlock authentication mode.

You should be able to locate them under Settings > Security. So if they're available on your phone, go ahead and set them up. All you have to do is swipe your finger or show your face. On phones with fingerprint sensors or facial recognition features, you need neither a power button nor a third-party app to unlock your phone. Take Advantage of Your Phone's Biometric Sensors
