Motorola V600 GSM R3.6 - Manual (Page 66)

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Call
ing Features
Outgoing Calls
You can show or hide your phone number as an
ID for the calls that you make.
You can override the default caller ID setting when you
make a call. While dialing (with digits visible in the display):
Turning Off a Call Alert
You can turn off your phone’s incoming call alert before
answering the call.
Calling an Emergency
Number
Your service provider programs one or more emergency
phone numbers, such as 911, that you can call under any
circumstances, even when your phone is locked or the SIM
card is not inserted.
Find the Feature M > Settings > In-Call Setup
> My Caller ID
Press To
M > Hide ID/Show ID hide or show your caller ID for
the next call
Press To
either volume key turn off the alert