[mikecism]

Yes, the Sprint Diamond does 3 way calling, and not the "TALK/TALK/TALK" way. (Although that works too, but is janky.)

Basically you call a person (via contacts or direct number), then press hold button, find next person (contacts), dial then, then press "conference" button. If now have three way call.
If you press "conference" button again, the second party is dropped.

I would pay cash money for a DECENT 3-way call app, ala slide to answer (something iPhone-ish)

I am flabbergasted this is not in the base ROM for the phone, and shocked no one has made an app for this!