Samsung SGH-T339RRATMB - Manual (Page 24)

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Displays when you are out of your service area.
Displays when a call is in progress.
Displays when the Call Forwarding feature is active. For more details, see “Call forwarding” on page 103.
Displays when Mute is enabled during an active call.
Displays when Vibration Mode is active.
Displays when Silent Mode is active.
Displays while your phone is synchronizing data with the network.
Shows the level of your battery. The more bars you see, the more power remains.
Displays when Bluetooth wireless technology is active.