I see the cell phone restrictions as another attempt to invade the privacy of citizens, by letting LE pull you over and get their eyes (and nose) inside your vehicle on the "suspicion" that you were using the device. In order to get the necessary proof of the offense, they will then have to download all information from your phone using one of those portable devices that were in the news recently and are already being used. EVERY automobile accident will result in the phones being downloaded, to determine whether either of the parties was illegally using their phone.
...And they will download EVERYTHING.
“Maybe I am a conspiracy nutjob, maybe not.”...
This is an interesting theory, but the problem is, that most of the information required isn’t on your phone anyway, it’s “safely” in databases at the provider’s facilities.