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Your phone allows you to quickly turn the screen off when not in use and to turn it back on and unlock it when you need it.
To quickly turn the screen off, press the Power key. Pressing the Power key again or receiving an incoming call will turn on your phone screen and show the lock screen.
To save battery power, the phone automatically turns off the screen after a certain period of time when you leave it idle. You will still be able to receive messages and calls while the phone’s screen is off.
Note: For information on how to adjust the time before the screen turns off, see Display Settings.