NZScion,
As a professional radio engineer for the last 47 years, it still amazes me that people can make displays and so on that are NOT immune to unwanted radio signals! Radio as in comms, nav etc is another matter. I rarely turn my mobile 'phone on anyway, and NEVER on an aircraft.
Interestingly, though, things like pacemakers, hearing aids, and other medical devices are increasingly having radio transceivers in them. Very low power, though - at the most, a few milliwatts, and in many cases, less than a microwatt.