LG optimus zone 3 User Manual page 59

OR
Use the buttons on the dialpad to manually enter a number, then tap
the Call button
4. After you're connected, tap the Merge calls button
screen). The participant is added to the conference call.
Merge Calls Button
Tap here to merge the separate
calls into a conference call.
Speaker Button
Tap here to turn the
speakerphone on (or off).
.
Mute Button
Tap here to mute the microphone during a call.
(on the Call
Dialpad Button
Tap here to dial another number to
participate in the conference call.
Bluetooth Button
Tap here to switch between a
Bluetooth device and the phone.
Calls
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