Samsung SCH-I600MSAXAR - Manual (Page 91)

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Call History
Three-way Calling
1. At the Home Screen, enter the number you wish to call,
then press
.
2. After the first caller picks up, dial the second person and
press .
3. When the person answers, press again to connect
all three parties.
If one of the parties in the conversation ends the call, the
remaining parties stay connected. However, if you initiated
the call and are the first to hang up, all calls are disconnected.