Samsung SCH-N150 - 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 will always appear, but
other icons display based upon 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. When
the phone is calling a number, this icon will flash until the call is
connected.
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.
Note: The no service indicator icon will always appear when you turn on your phone. As
soon as service is located, the indicator will disappear.