Nokia 2135 - Manual (Page 18)

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3. Call functions
■ Make and answer a call
To make a call, enter the phone number, including the
country code and area code if necessary and press the call
key to call the number. Scroll right to increase or left to
decrease the volume of the earpiece or headset during the
phone call.
To answer an incoming call, press the call key. To end a call,
or reject an incoming call without answering, press the
end key.
■ Conference Calling
Conference calling is a network service that allows you to
take part in a conference call with another two participants.
To make a call to a new participant, select Options > New
call. Enter the number you want, and press the call key. When
the new call is answered, press the call key to connect the
calls. To end the conference call, select Options > End all
calls, or press the end key.