I suppose its just like my youth when my sisters would fight over the phone and take turns jabbering for hours on end.
4 well placed EMP weapons detonated about 120,000 ft above Los Angeles, New York, Washington and Chicago - that's be the end of that. Of course, that'd be the end of a lot of stuff too.
A similar oft-stated thought; when the SHTF there will be millions of un-plugged drones without a clue... about anything.