I have to comment about the 'control' aspect when using a mobile and driving - it does not actually equate directly with other occupations - changing radio channels, eating, and so on.
I used to answer a customer phone line in my job, and was provided with a 'hands free' to enable me to continue talking while moving between computers, chacking files and so on. Frequently, when concentrating on my conversation, and moving around the office, I bumped into furniture, and occasionally colleagues - my spatial awareness simply deserted me - which is whathappens when driving and talking on a phone.
That's why it is dangerous to drive and talk on a mobile.
It remians to be seen if the law works.