LG v20 User Manual page 68

Calls
66
To set up a conference call
Contact your wireless service provider to find out whether they support
conference calls and how many participants you can include.
1. Place a call to the first participant.
2. When you're connected, tap the Add call button
3. Enter a phone number.
Use the Phone app tabs to select a saved number, then tap the Call

icon
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
The participant is added to the conference call and the Call screen
indicates a conference call is active.
.
.
Merge Calls Button
Tap here to merge the separate
calls into a conference call.
on the Call screen.
on the Call screen.