Sorry for the late reply
but i don't have experience programming this stuff..
i ran a small search i think the developers.sun.com would not put useless details :P
check this:
http://developers.sun.com/techtopics/mobility/midp/articles/bluetooth2/
there are also some nice links at the end of the page
i think u should find a forum specified for cell phone programing, like the nokia programmer forum
or sun, u have a better chance to learn there
good luck with ur application
what is it about ?