LG G3100 User Manual page 199

To put a multiparty call on hold, select the [Options] key then
.
To de-activate a multiparty call on hold, select the [Options] key then
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.
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