Samsung SGH-I997ZKAATT - Manual (Page 56)

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This feature joins all of the calls you have established with your
phone (both active and on hold) into a multi-party call.
1. Tap and slide to the right to answer the call.
2. Tap and slide to the right to answer the next call.
The first call is put on hold.
3. Join the first two callers into a single multi-party call by
tapping Join.
4. To disconnect one of the callers, press then tap
Manage Conference Call.
All calls on the conference call will be displayed.
5. Tap next to the call you want to disconnect.
6. Tap Back to call to return to the call screen.
7. Tap to end the call.