It seems to me it doesn't matter hands-free or not, your attention is not on your driving, so no use of the phone at all is the best. And how come a lot of cell phones don't work in Walmarts (someone said it had something to do with their p.a system??) why can't it be engineered into a car so a cell doesn't get reception? Maybe only while the car is turned on, or in motion, then in an emergency it could be used.