Thank you all very much for your help. I went over my paperwork and looked at all the options in my car and phone prep was not on the list. Satellite radio prep was. I have a feeling that the cable bundle in my trunk is for satellite and not phone prep.
A couple things have led me to this conclusion:
1. Phone prep SA640 is not on my list
2. I do not see black or yellow cables in the bundle at all.
This leads me to believe that a mic cable has not been run from the MULF2 unit to the glove box. I do have voice control which works but perhaps that does not run to the Mulf2, is that correct?
My car is a 08/2008 build MT2009 e90 335 but it seems it is not prewired for bluetooth. I am a bit bummed if that is indeed the case.