Samsung SGH-X507HBACIN - Manual (Page 22)

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Section 2
Back Light
A back light illuminates the display and the keypad when
you press any key or open the phone. It turns off when no
keys are pressed within a given period of time, and/or
dims the light, depending on the settings in the Back
Light
menu.
Internal Display Layout
The display has 3 areas:
Icons
Shows the received signal strength. The greater the
number of bars, the stronger the signal.
Appears when a new text message has been received.
Appears when a new voice mail has been received.
Appears when a new multimedia message has been
received.
Appears when you set an alarm to ring at a specified time.
For details, see page “Alarm” on page 128.
Appears when you there is no network coverage available.