I know its not much help but I know they make a adapter that plugs into your obdII connector on your car and the other into your USB port on the phone then u blue tooth them together. If you Google it I'm sure something will pop up i know its for android though not sure if they make for i phone or anything
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there are those of us who choose to fight and those of us who choose to stand on the fence and watch not wanting to get involved. but we all search for a small measure of inner peace but few of us ever find it