It makes sense that banning the use of cellphones (texts/calls) while driving doesn't actually decrease the number of accidents. If someone wants to text or call someone while driving, they're going to do it whether or not it's illegal. Now that we have these laws banning their use, people are more likely to use their phone where it is out of plain view. Now because of the ban, you've got people looking into their laps instead of at the road.
And yet, people are still pushing full-on bans of cellphone use in vehicles. I'm telling you, it's not going to prevent anything.