Samsung GSM1800 - Manual (Page 54)

Options During a Call
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4. To add a new person to the multi-party call, call
the person in the normal way and press the
Options soft key. Select the Join option and
press the OK soft key.
You can add incoming callers by answering the call,
pressing the Options soft key, and selecting the
Join option. Repeat as required.
Having a Private Conversation With One
Participant
1. Press the Options soft key and choose the
Select One option. Press the OK soft key.
The list of call participants appears.
2. Highlight a person from the list by pressing
the Up or Down key, and press the Select soft
key or the
key.
3. When the Private option highlights, press the
OK soft key.
Now you can talk privately to that person. The
other participants can still converse with each
other.
4. To return to the multi-party call, press the
Options soft key and select the Join option.
Press the OK soft key.
All the multi-party call participants can now hear
each other.