Samsung SGH-S275DAATFN - Manual (Page 26)

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Backlight
A backlight illuminates the display and the keypad when you press
any key. The backlight dims or turns off when no key is pressed
within a given period of time. Go to the Backlight Time menu to
modify these settings.
Ⅲ Press Menu ➔ Settings ➔ Display ➔ Light Settings ➔
Backlight Time.
Selecting Functions and Options
Your phone offers a set of functions that can be customized for your
use. These functions are arranged in menus and sub-menus. Each
menu and sub-menu allows you to view and alter the settings of a
particular function.
In some functions, you may be asked for a password or PIN. Enter
the code and press the
key.
When you access a list of options, your phone highlights the
currently active option. If there are only two options, such as On/Off,
your phone highlights the option that is not currently active, so that
you can select it directly.