Sounds like TSA idiocy. Totally lacking logic.
If somebody wants to do either of the above things, they can do it today. Think though this for a nano-second. How does the flight crew know if you turned off that gadget in your pocket?
Bottom line, I would bet a million ipads that there is at least one phone turned on in every single flight. People just forget to turn them off. Simple stuff.
There is for sure. There is at least one phone and other electronic device left active on every flight. Either overhead, in pocket, or down below in the cargo hold.
There was a time when analog cell phones would mess with the towers on the ground. It was never an issue with the pilots communications.