Samsung SPH i700 - Manual (Page 88)

Chapter 10 - Call Features
88
Three Way Calling
Three way calling allows you to talk to two different
people at the same time. When using this feature,
normal airtime rates apply for each of the two calls.
To use three way calling:
1. Enter the number you wish to call and tap .
2. During the conversation, tap .
3. Dial the second person and tap .
4. When the person answers, tap again to connect
all three parties.
If one of the people you called hangs up, you and the
remaining caller stay connected. If you initiated the call
and are the first one to hang up, all three calls are
disconnected.