Google Android 2.3 User Manual page 91

Placing and receiving calls
3 Place the next call, using the Phone tab, the Call log, or your contacts.
When you're connected, touch Merge calls.
4
The participant is added to the conference call.
You can add as many callers as your carrier supports.
During a conference call, touch Manage to drop a conference call participant or
to talk privately with one of the participants.
End a conference call and disconnect all callers
Touch End.
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Android User's Guide