I was just watching the CBS Morning Show and they had a consultant for the NTSB on there. They made their case and all and even suggested that all cell phone manufacturers have an app where it disables your phone while moving. Only problem is NO ONE is going to willingly install an app that disables your phone. You have to go apart from something people can't avoid; placing scrambler devices in all model vehicles that is enabled once the vehicle is in drive and reverse, and it turns off once the car is in park. It could be something as simple as a thin piece of a specific kind of metal that has a weak electrical current moving through it that is just enough to stop a cell phone network signal. Or they can use some type of radio frequency to scramble it. I have heard of scramblers being used in prisons, in parts of hospitals where cell phone use is to be restricted and in other places such as theatres that don't want customers distracting other customers with cell phone use during a movie.
The technology is there, we just have to use it. Perhaps such scrambler devices for vehicles can be mandatory in year model 2016 and all vehicles will be required to have it by 2026.
Until this technology becomes mandatory in vehicles as a safety feature, the police will have to aggressively enforce it.
That's just my two cents.