I just want to prevent my students from taking phone calls during class and maybe getting outside help during an exam. The University I work at is located in the highest cellphone-per-person ratio in the world - 1.1 phones in use per person nation-wide. I know people who have three different, functioning cellphones(this is due to competition between phone service providers). Additionally, the school has no formal honor system so I can't expect the students to fulfill the panoptic role of informing on each other when cheating does occur.
Now if I had a "Microwave Bubble" I could destroy all cellphones regardless of them being on or off; render useless the car of that idiot driver I encountered during the commute this morning. However, the prospect of even briefly exposing people to that kind of radiation is criminal: pace makers; brain cells, the plethora of unintended consequences ... Maybe I can borrow a phrase from the gun lobby: [technology] doesn't [annoy] people, people [annoy] people. Or something like that.
I think the irritation we experience with cellphones is on par with the problems people encountered when land-based phones were first introduced into the home. The sentiments are the same: in Italian they answer the phone saying "Pronto", as in "Quickly, your call has interrupted what I was doing and I don't want to be on the phone."