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Update the software so that BMW Assist can't call the car? I seriously doubt that! Onstar encourages making phone calls through their system (free at first, and then a premium is charged).
I remember buying in to the rumor, that BMW Assist and Bluetooth would co-exist peacefully (*deadline being late last Fall
Nowadays, it takes a link, or at the minimum, a quoted source, [read] for me to take anything as gospel.