I just purchased a 2003 530i and was very interested in the article about Bluetooth capabilities. How I can find out if my car already has this feature in my vehicle or what I would have to do for Bluetooth functionality. I have indicators of hands-free cellular on the steering wheel and on dash near radio controls but not sure how they operate. My sales person didn't have a clue and there was no manual about the integrated Cellular features. I suspect I have to buy some optional components - what do I need and where do you get them?