Whatever the volume of the radio happens to be when the 'phone rings is the same volume of the 'phone. In the X3, one can adjust the volume using the steering wheel volume controls. Again, not sure if that's true for all bluetooth enabled BMWs. An easy way to figure this out is to have someone call you while you're in your car (or you can call your mobile 'phone using a cordless home 'phone, for example) and fiddle with the volume of the radio so you can see if this is the fix you're looking for. Hope this helps, and GL.
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