LG C3310 User Manual page 209

In-Call Menu
Muting the Microphone
You can mute the microphone during a call by pressing the [Options]
key then selecting [Mute]. The handset can be unmuted by pressing
the [Unmute]. When the handset is muted, the caller cannot hear you,
but you can still hear them.
DTMF tones while calling
To switch on DTMF tones while calling (e.g. to use the phone with an
automatic switchboard) press the key [Options] followed by Send
DTMF – DTMF on. Select DTMF off to disable DTMF tones. DTMF
tones are normally on.
Conference Calls
The conference service provides you with the ability to have a
simultaneous conversation with more than one caller, if your network
service provider supports this feature. A conference call can only be
set up when you have one active call and one call on hold, both calls
having been answered. Once a conference call is set up, calls may be
added, disconnected or separated (that is, removed from the
conference call but still connected to you) by the person who set up
the conference call. These options are all available from the In-Call
menu. The maximum callers in a conference call are five. Once
started, you are in control of the conference call, and only you can
add calls to the conference call.
Making a Second Call
You can make a second call while currently on a call. Enter the
second number and press the . When the second call is
connected, the first call is automatically placed on hold. You can swap
between calls, by pressing the key.
32