1. While on a call, drag Accept to the right to put the current call on hold and answer an incoming call.
   
2. Tap the Switch icon to switch between calls.
   
3. To add a number to a call, tap the Add icon to call a contact, or tap Keypad to enter a number.
   
4. When the call connects, tap the Link icon to merge the calls.
   
5. To end the call, tap End Call.