Tap Start > Settings.

Set time for the backlight and Sleep mode

Set the device to turn off the backlight and switch to Sleep mode when not in use or during a call. By doing this, you can save battery power and reduce battery consumption.

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2 From the Basic Settings tab, tap General Settings > Power

>Battery Power.

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Select a duration from the Turn off backlight field.

Select a duration from the Turn off device field.

Tap Done.

Your device automatically turns off the screen when you hold it close to your face during a call. When you distance the device from your face, the screen turns on again.

Even if you select Always turn on, the screen turns off 1 minute after it turns on during a call.

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Samsung GT-18000 manual Set time for the backlight and Sleep mode