Samsung SGH-t309 - Manual (Page 102)

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Select Main LCD or Front LCD and press the Select soft
key. Press the Left or Right Navigation key or press the
Volume
keys to adjust the contrast.
Backlight
In this menu, you can select the length of time that the
keypad backlight is on and how much longer the display
is illuminated before going off.
The On setting is how long the keypad backlight is on. You
can select 15 seconds, 30 seconds, 1 minute, 3 minutes, or
10 minutes.
The Dim option is how much longer after the keypad
backlight goes off that the display remains lit. You can
select Off, 5 seconds, 15 seconds, 30 seconds, or 1 minute.
For example, if you set On for 30 seconds and Dim for 5
seconds, after 30 seconds the backlight on the keys would
turn off and 5 seconds later the display light would turn
off.
Press the Left or Right Navigation key to adjust the
settings.
Dialing display
This menu allows you to select the size and color of your
dialing font.
To change the size of the font:
1. Highlight the Font size option and press the Select soft
key or the key.
2. Use the Left or Right key to select between Large,
Medium, or Small.