1. To add another call while on an active call, tap the Add call icon.
   
2. Dial the Desired number or select the Desired contact and place the call. Your Original call will be put on hold.
   
3. To merge calls, tap the Merge Calls icon.  The calls will become a conference call.
   
4. To put the conference call on hold, tap the Hold icon.
   
5. Tap the Hold icon again to resume the call.
   
6. To disconnect one call, tap Manage conference call.
   
7. Tap the End call icon next to the contact you would like to disconnect.
   
8. To disconnect all calls, tap the End call icon.