Samsung SCH-850 - Manual (Page 21)

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16. LED Indicator: Flashes to indicate an
incoming call or message. When you
have the phone closed and the ringer set
to off, the LED indicator will notify you
that you have an incoming call or mes-
sage.
♦
The LED also lights up (flashes) for a few
seconds when you turn on the phone.
17. Antenna: Makes the call sound clearest
when it’s fully extended. Your antenna is
easily replaced by just screwing in a new
one.