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this technique was actually talked about on Defcon hacker convention in Las Vegas. Bluetooth hacking was used with a long range yagi antenna that some guys setup on a bridge over a freeway pass. They did secessfully listen in on conversations, 3 way, download phonebook, etc. All this with/o the cell holder finding out.
The onstar thing theirs tutorials for that too. All this is fairly public information if you search long enough and play with your software and hardware enough to get good results.
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