It should be treated in the same class as driving while drinking. If you are in an accident that involved your phone usage you have to put your phone in a box before you can start your car or some similar mechanism to the in car breathalyzer.

I am the only person in my family I know that doesn't use my phone while driving. Something I don't think has been addressed here is that there is much less social pressure on people to not use phones while driving. Nobody would let someone drive a car if they knew they are drunk but many people allow others to use their phone while being the driver.