If your steering wheel already has the buttons you are pre-wired for telecomm. What you need to do is by a TCU module install it and have the vehicle programmed to activate bluetooth.
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2003 325xi (retired)
2004 530i (retired)
2008 X3 3.0i (retired)
1997 Z3 1.9
2014 X1 28i xdrive
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