Fair point, I don't know how these issues are addressed with the current technology .. but I do know, these jammers are out there and can be deployed by those who want a cell-phone free environment. Every location that I've seen them in has a big sign, usually, on the front door that says "YOUR CELL PHONE WILL NOT WORK IN HERE", or something to that effect .. its up to the owner of the technology to work out what to do in that case, I guess.