To unlock the phone

If you don’t use the phone for a while, the screen and backlight will turn off to conserve battery power. To unlock the phone’s default Lock screen:

NOTE

The default Lock screen simply locks the screen to prevent unintentional actions. For more security to guard against unauthorized use, you can set an unlock requirement (such as a Knock Code, pattern, PIN, or password) that will need to be entered to unlock it.

Turn the screen on.
- Press the Power/Lock Key .
  
  NOTE
  Avoid covering the proximity sensor when turning the screen on. Doing so will prevent the screen from turning on.
  
  OR
- Quickly double-tap the center of the screen (KnockON).
From the center of the screen, swipe in any direction to unlock it.