I currently have a D1 and cant stream music via bluetooth to my car stereo. My stereo is capable but i dont think the D1 has A2DP capability. Question is: Will i be able to do this with a D4? I've worn the 3.5mm jack out on my D1. I'm due for an upgrade on 2/25. I'm going to try and get my upgrade this weekend. Keeping my finger crossed.
Also i should add that my radio does make/receive calls via bluetooth already. i can also access my phonebook on my stereo.
here is a link to the user manual for my stereo. go to page 34 if you're interested in helping me figure this out.