Samsung SGH-X427 - Manual (Page 19)

Your Phone
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Backlight
A backlight illuminates the display and the keypad. When
you press any key or open the folder, the backlight turns
on. It turns off when no keys are pressed within a given
period of time, depending on your setting in the Back
Light menu (Menu 4.6.2). After one minute, the display
turns off to conserve your battery power.
To specify the length of time the backlight is active, set the
Back Light menu (Menu 4.6.2). See page 85 for further
details.
You can also set the phone to use the backlight only during
a specified period of time, in the Auto Light menu (Menu
4.6.3). See page 86 for further details.
Service Light
The service light is at the top right-hand corner of the
phone. It flashes when services are available on the phone.
To activate or deactivate the use of the service light, set
the Service Light menu (Menu 4.6.4). See page 86 for
further details.
Service light