I am not sure about the 8100, but on my 8820 I could not get the media player to work with a bluetooth headset. I did some surfing and found that downloading the mobiol xPlayer allows this. You can download it for free if you intend to only play content from your phone, but if you want the Live Radio feature you have to pay for it. When installed go to MENU -> Settings -> General -> and in Playback Audio Path, choose Bluetooth. (make sure bluetooth is on or it will play thru the phone) when a call comes in, the player will pause so you can answer the call.
