There are two versions of the BT system possible for your car. One uses the Bluetooth "ULF" module. This is the most common with retrofit and upgrade installations. Everything except SMS support works perfectly with the Blackberry 8100 and 8800. I have tested both of them in my car with several different versions of the ULF modules.

I am not sure about the BMW Assist version of the BT system. But, I think that it works just fine with the BB products as well (except for SMS support).

__________________
SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input