Setting A Screen Lock; Setting Up Face Unlock - HTC One M8 User Manual

328 Settings and security

Setting a screen lock

Help protect your personal information and help prevent others from using
HTC One without your permission.
Choose to set a screen lock pattern, numeric PIN, or other means of
securing your phone. You'll be asked to unlock the screen every time
HTC One is turned on or when it's idle for a certain period of time.
1. Go to Settings, and then tap Security.
2. Tap Screen lock.
3. Select a screen lock option and set up the screen lock.
4. Tap Lock phone after, then specify the idle time before the screen
is locked.
You can also clear Make pattern visible or Make passwords visible
if you don't want your screen lock to display as you enter it
onscreen.

Setting up face unlock

Set up face unlock if you want to unlock HTC One using the front camera.
1. Go to Settings, and then tap Security.
2. Tap Screen lock > Face Unlock.
3. Tap Set it up and follow the onscreen instructions.
4. Choose a backup unlock method to use in case the phone doesn't
recognize you.