After a period of inactivity, the phone screen turns off to conserve battery power. You can set the idle time before the screen turns off.
Tip: To turn off and lock the screen quickly, press the Power/Lock button.
- Tap > > Settings.
- Tap Display, gestures & buttons.
- Tap Screen timeout, and then tap the time before the screen turns off.
Note: Extended screen timeout periods reduce the battery’s talk and standby times.