LG G5200 User Manual page 210

The menu displayed on the handset screen during a call is different
to the default main menu reached from the idle screen, and the
options are described here.
You can place a call on hold or retrieve by just pressing the
[Send] key. When a call is made or answered, press the [Send]
key to place it on hold. When a call is held, press the [Send] key
to make it active.
You can get a dial number from phonebook to make a second call.
Press [Names] key then select . To save the dial number
into phonebook during call, press [Names] key then select
.
To switch between two calls, select the [Menu] key, then select
Swap or just press [Send] key.
You can make one of two calls focused by pressing up/down arrow
key. If you want to end one of two calls, make the call you want to
end focused, then press [End] key when the call you want to end
is focused.
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