When you have one call established, you can place that call on hold and make a second call.
To place a second call using the dial pad
Tap Hold to put the first call on hold
Tap Add Call
Use the Phone (Dial Pad), Contacts or History to place your second call.
Once you have two calls established, you can merge the multiple calls into a conference call. You can also split the conference call back to separate calls.
You can merge two existing calls into a conference call.
Jet Phone merges the calls into a conference call and displays Conference. If you end
the call, both remote parties are disconnected. The remote parties cannot continue the
call without you.
After you have merged two calls together, you can split them back into two separate calls.
Tap Split Calls.
Jet Phone splits the calls and displays the name of the remote party for the active call.