LG G5220C - Manuel (Page 202)

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Additional Functions
2-9 Ending a Multiparty Call
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/End multiparty.
Selecting the [Options] key then Multiparty/End all, will end all the
active and held calls.
2-10 Explicit Call Transfer (ECT)
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 Multiparty/Transfer option from the in-
call menu.