Call Conference Trick on Motorola Droid 2 & Droid 2 Global (Might Work on Photon & other Handsets as well)-----
Create a contact with name 'A and save number 3, 1. all seperate.
For Example
Name - 'A
Mobile - 1
Home - 3
And call the 1st person, after call connects. Add call and dial the second person.
When your call connects, press home & open contacts. Open 'A and select/Dial 3 to call conference.
And same way you can press home, Open contact 'A & Select/dial 1 to disconnect last called person.
Please give me +1 if this works for you & Helps you.
Thanks.