Note that it is possible that if you have a MULF-2 unit to code for bluetooth so all you need to add is a BT antenna and the mic. My '08 328xi touring has the MULF-2 and I successfully added the Bluetooth to the VO. After letting the car sleep, the "Phone" option appeared in the radio and I can place calls, etc. I'm currently waiting for my microphone and antenna to come in from Tischer.
I believe MULF-2 High units are found in cars with BMW Professional radio with USB in the center console. It's easy to check, just pull up the cover in the trunk and look for it!