Samsung SCH-T300 - Manual (Page 35)

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The Top Line of the Display Screen
Display indicators (or icons) appear across the top of your phone’s
display screen. The signal strength and battery strength icons are
always displayed, but the 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. The more lines displayed, the
better the signal strength. Four lines indicate maximum 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 are outside a service area. When displayed, you
cannot send or receive calls. Wait for a better signal or move into an
open area to regain service.
Note: The no service indicator always displays when you turn on your phone.
When service is located, the indicator disappears.
Roaming: This icon displays when the phone is outside your
carrier’s area and receiving service from another carrier’s network.
If you are: