Huawei U8100 User Guide - Manual (Page 152)

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Managing Your Mobile Phone
Adjusting the Time Before the Screen Turns Off
If your mobile phone is idle for several minutes, it will turn off the
screen to save battery power. To set a longer or shorter idle time
do the following:
1. On the Settings screen, touch Sound & display > Screen
timeout.
2. Select the time you want the screen to be illuminated.
Setting Ringers
Turning On Silent Mode
1. On the Settings screen, touch Sound & display.
2. Select the Silent mode check box. Then all sounds except
media and alarms are silenced.
Adjusting the Ringer Volume
You can adjust the ringer volume when you are on the Home
screen or any application screens (except during a call or when
playing music or videos). Press the Volume keys to adjust the
ringer volume to the desired level.