GMC Terrain 2010 Owner's Manual page 201

Switch Call: Turn or press the
menu select knob to Switch Call
and press Enter or touch the
Switch Call option.
Conference Calling
Conference and three-way calling
must be supported on the Bluetooth
phone and enabled by the wireless
service carrier to work.
To start a conference while in a
current call:
1. Press the hard key on the
faceplate until the Phone main
screen is shown with the current
active call.
2. Select the Enter Number
option.
Infotainment System
3. Make another call. The first call
will be placed on hold while the
second call is dialing and
connected.
4. To make a conference call,
select the Merge Calls option
which will merge both calls into
one conference call.
5. To add more callers to the
conference call, repeat Steps 2
through 4. The amount of callers
that can be added are limited by
your wireless service carrier.
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