4. Choose a backup lock to use in case the phone doesn't recognize
you.
5. Tap Lock phone after, then specify the idle time before the screen
is locked.
You can also tap Improve face matching on the Security screen to
train Droid DNA by HTC to recognize your face in different
situations, such as when you're wearing glasses or sporting a
beard.
You'll be asked to unlock the screen every time Droid DNA by HTC is
turned on or when it’s idle for a certain period of time.
To further improve security, select Liveness check on the Security screen.
You'll be asked to blink to unlock the screen.
76 Personalizing