Samsung Galaxy S III User Manual page 108

2. Once you have established the connection, tap Add call, and dial the second number (or place
the call from Logs or Contacts).
 This puts the first caller on hold and dials the second number.
3. When you are connected to the second party, tap Merge. Your conference call is now in session.
4. To end the three-way call, tap
Note: If one of the people you called hangs up during your call, you and the remaining caller stay
connected. If you initiated the call and are the first to hang up, all callers are disconnected.
Phone App
.
99