Wait do you not have the factory Bluetooth module?
You should..what I do is activate phone first then press phone button on the side of the MID/NAV screen
It asks for code at first but from then on it connects automatically
I hope I didn't just made a fool out of myself explaining something you already know.

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2006 X5 4.8is LeMans Blue / creambeige interior
Prod.date: 2006-06-21