Samsung GALAXY CORE Prime User Manual page 114

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
.
Phone App 106