Samsung SCH-3550 - Manual (Page 24)

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Display indicators (or icons) appear across the top of your
phone’s display screen. The signal strength and battery strength
icons will always appear, but other icons appear based your
phone’s operating mode.
Signal strength: This icon always appears when your
phone is on, and shows your current signal strength.
More lines indicate more signal strength. Four lines
indicate maximum strength, and one line indicates
least strength.
Service indicator: This icon indicates a call is in
progress. If there is trouble with signal strength, this
indicator will have a diagonal line through it.
No service indicator: This icon indicates your phone
cannot find a signal because you’re outside a service
area. When this is displayed, you cannot make or
receive calls. Wait a little while for a signal or move
into an open area.
Signal
Strength
Battery
Strength
No Service
New
Message
Analog Mode
Vibrator on
Roaming