HTC DROID Incredible - Manual (Page 68)

 Phone calls
When you receive another call, tap Answer to accept the second
call, and to put the first call on hold.
To switch between callers, tap the person you want to talk to on
the screen.
To end the current call and return to the other call, tap End call.
Setting up a conference call
Make a call to the first participant.
When connected, press MENU, tap
Add call, dial the number of
the second participant, and then tap Call. The first participant is
put on hold when you dial the second participant.
When connected to the second participant, tap (merge).
To add another participant to the conference call, tap , and
then dial the number of the contact you want to invite to the
conference call.
The conference call is put on hold when you call another contact.
When you are connected to the other contact, you can talk to that
party in private.
When connected, tap to add the participant to the conference
call.
When finished, tap
End call.
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