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.
1 Tap Start > Settings.
2 From the Basic Settings tab, tap General Settings > Power > Battery Power.
3 Select a duration from the Turn off backlight field.
4 Select a duration from the Turn off device field.
5 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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