Samsung GH68-03299A - Manual (Page 8)

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Backlight
The display and keypad are illuminated by a
backlight. When you press any key, the backlight
illuminates. It turns off if no key is pressed within a
given period of time, depending on the Backlight
option set in the Phone Settings menu. The
backlight remains on at all times when the phone is
connected to an optional car kit.
To specify the length of time for which the backlight
is active, set the Backlight menu option; see
page 82 for further details.
External Display
Your phone has an external display on the cover,
showing the signal strength and battery strength. It
indicates that you have an incoming call or message,
notifies you of any missed calls, indicates whether
the vibrate mode is on and notifies you at the
specified time when you set an alarm.
When you hold down one of the volume keys in idle
mode with the phone closed, the external display
backlight illuminates.
Icons
Shows the received signal strength. The
greater the number of bars, the stronger
the signal.
Appears when a call is in progress.
Appears when a new text message has
been received.
Appears when a new voice mail message
has been received.
Appears when you set an alarm.
Appears when the vibrate mode is on;
the phone vibrates rather than rings
when you receive a call.
Shows the level of your battery. The
more bars you see, the more power you
have left.
Appears when the phone can not find a
signal.