not really
They sense acceleration, not movement. it requires GPS to sense movement over a distance. Still, that could be a passenger as easily as a driver, there;s no way to pinpoint the phone to the front left sear (or right in other countries).
the enforcement here is simple:
1) you can be pulled over simply for having something (ANYTHING) in your hand while driving a car.
2) ALL voice use of cellphones by the driver must be through integrated systems starting with all new cars, and through aftermarket systems or blue tooth single-ear headsets for older models, NO exceptions.
3) All phones must support voice dial at no extra charge from this point forward.
4)If you are pulled over, and a cell phone is visible anywhere near a driver, the cop will take the phone number, call the provider on a hotline, and confirm is SMS or e-mail have or have not been sent from the device during the current trip (easily validated by noting the length of time it was traveling by tower hopping or GPS log, but that can be done without revealing WHERE they dove to/from without a further court order, aka, i can tell you were driving on a freeway for 2 hours without a stop, but i don;t have to tell the cop where to or from), then they check the log in the phone. If SMS were sent during that time, but do not appear in the log, it's not only that you're charged of texting while driving (which a court will latter disseminate from more detailed records), but of destruction of evidence too. If SMS were received, but were deleted, clearly they had to be read to do so, and you're also guilty.
5) make the penalty for using a cell phone while driving equal to the penalties for drunk driving.
6) apple vehicular manslaughter laws equally to accidents caused by distracted driving.
We don't need to block phones, we don't need to mandate additional equipment (other than OPTION equipment to use a hands free device while driving, that's your choice if you want to, with the exception that all cars should have this built in so the car itself can dial 911 in even of a wreck in order to save lives). We just need to make sure people don;t do this. Putting blocks on cell use while driving through Jammers is exactly the same as if they required a breathalyzer ignition test on all cars. They'll never pass either, so we go the easy route: very strict enforcement.
It may be a privacy concern for cops to have access to detailed call records and GPS logs in the effort to prosecute drivers texting but it is NOT a privacy concern for them to have access to a "was it used or not" report. We can easily accommodate that.