"Cellular carriers, having spent years trying to blanket the nation with phone service, are now working on ways to stop people from getting calls and texts when they are behind the wheel.This "feature" comes at a price. The off switch is free. So is turning off the ringer.
The technology is aimed at curbing dangerous distractions by temporarily interrupting service, short-circuiting the temptation for people to respond to the chime of their phones. ..."
This would have the effect of limiting all cell phone use in moving vehicles -- passengers as well as drivers. It would likely render hands-free systems moot.
I am not a particular fan of the "nanny state", but I am a fan of obeying traffic safety laws. If it against the law, then enforce it!