LG G4020 - Manual (Page 41)

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In-Call Menu
Private Call in a Conference Call
To have a private call with one caller from a conference call, display the
number of the caller you wish to talk to on the screen, then press the left
soft key. Select the Private menu of Conference call to put all the other
callers on hold.
Ending a Conference Call
Currently displayed caller from a conference call can be disconnected by
pressing the
key.