I got my X3 in Jan 05 and it did not function by pushing the little face button for the voice recognition. (It works fine w/ the BT phone, but not with the nav, etc.) I took it to the dealer a couple of months ago to see if it could work, and they took it on as a project and were able to get it working, but they wanted $900 for the little part and their labor. I declined.
2005 X3 3.0i, Sapphire Black, Black Leather, Dark Wood, Automatic, Premium Pkg, Premium Sound, Navigation, Privacy Glass, Heated Front Seats , Chrome Exhaust Tips