LG G3100 User Manual page 169

To join an active call to the held multiparty call, select the [Options]
key then .
To scroll through the numbers of the callers who make up a
multiparty call on the handset screen, press U and D keys.
To place one selected caller (whose number is currently displayed
on-screen) of a multiparty call on hold, select the [Options] key then
.
To have a private call with one caller of a multiparty call, display the
number of the caller you wish to talk to on the screen, then select
the [Options] key and to put all the other callers
on hold.
The currently displayed caller of a multiparty call can be
disconnected by pressing the [End] key. To end a multiparty call,
press the [Options] key then select multiparty.
Selecting the [Options] key then , will end all the
active and held calls.
If you have one caller on hold and another active call, you may
connect one call party to another call party and then leave the call.
This is done by selecting the option from the
in-call menu.
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