Actually the best way would seem to be some device that would instantly disable the iPhone if you were pulled over. I somehow doubt they are going to start conf

Actually the best way would seem to be some device that would instantly disable the iPhone if you were pulled over. I somehow doubt they are going to start confiscating everyone's phones with dead batteries (with no other reason for arrest or search) just to check the contents. "I'm sorry officer, my phone's battery is dead so I clearly wasn't texting while driving. Am I being detained, or am I free to go?" But probably the easiest thing to do is to quickly slide your phone into a compartment (not hidden, just closed) in your car when you get pulled over. Then they must get a warrant to search your car. Most cops don't push it to this level unless you actually did do something.