Locking and unlocking the screen
When your device is on and left idle for a set period of time, the screen darkens to save battery power. You can set a lock that prevents unwanted actions on the touchscreen when you are not using it. You can change the security settings later and add other kinds of locks. See Screen lock
To turn the screen on or off
- Briefly press the power key .
To lock the screen
When the screen is active, briefly press the power key .