You can add more people to an active call to form a conference call using the Add call button.

To start a conference call:

1. On the call screen, tap the Add call button.
   
2. Use the Keypad to dial the other party's extension or telephone number.
   
   

   Use the Other Pages of the App to Start a Separate Call

   You can use the other tabs of the app to start a call with the person you need to add to an active call.

   If you have a contact for the other person, you can go to the Contacts tab, select a contact of the person to add to the call, and tap the Call icon next to their contact number.
   

   If you have talked with the person to add to the call in the past, go to the Call History tab, select a call log from that person, and tap Call option to transfer to that person. 
   

   If you intend to add someone to the call that has left a voicemail message before, go to the Voicemail tab, tap a voicemail left by the person to add to the call, and tap the Call button.
   

   To add a person to the call from an existing chat/SMS conversation, go to the Chat tab, tap the conversation with the person you would like to call, tap the Options icon, and select Call. 
   

    

    

   ✔ The first call will be placed on hold while the second party is dialed.

    
3. Tap the Join button when the second recipient answers the call.
4. To add more people, repeat steps 1 to 3.
   
5. To dismiss a conference call, touch the End Call button.
   

   Quick Tip: Ending the call will only remove you from the call. The other call's participants will be able to continue speaking with each other.