I ordered the adapter that includes a mic from the Blackberry site. It was something like $15. Then you can use any regular headphones of your choosing. I also gota set of headphones that included a mic at Best Buy. Both work fine. I tried the adapter from RS also and had no luck with it. I believe that as long as you get an adapter the includes a mic (RS one did not) then you will be fine. I do not think you can use a USB headset.

BTW: the BB IS a 4 way connector, not 3.