I agree with Larkspeed; bluetooth kits and bluetooth stereos are so simple to fit that there is really no excuse for not having one if you need to be talking on the phone whilst driving.
After catching my father and a friend doing this you better believe they got lectured into purchasing bluetooth car kits, which I dutifully fitted.
I've given up trying to get other people to follow the law but it still bugs me to see people swerving all over the road, cutting people up, not keeping up with traffic and all because their holding a phone and not paying attention.