LG C3300 User Manual page 136

The multiparty or conference service provides you with the ability to
have a simultaneous conversation with more than one caller, if your
network operator supports this feature. A multiparty call can only be
set up when you have one active call and one call on hold, both
calls having been answered. Once a multiparty call is set up, calls
can be added, disconnected or separated (that is, removed from
the multiparty call but still connected to you) by the person who set
up the multiparty call. These options are all available from the
In-Call menu. The maximum callers in a multiparty call are five.
Once started, you are in control of the multiparty call, and only you
can add callers to the multiparty call.
You can make a second call while currently on a call. Enter the
phone number and press the key. When the second call is
connected, the first call is automatically placed on hold. You can
swap between two calls by pressing the left soft key then selecting
.
Place one call on hold and while the active call is on, press the
leftsoft key and then select .
Press the left soft key, then select .
Press the left soft key, then select .
To add a call to an existing multiparty call, press the left soft key,
then select .
C3300 User Guide