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Found this answer in addition to the one above:
Cell phone jammers are illegal in most countries — except to military, law enforcement and certain governmental agencies.
You are S.O.L. I think....
I would LOVE it if they could be used at school....and then shut off if there was an emergency.
So many kids text during school...and cheat their azzes off. Would it block texting.
Those kids sit in class and can text a message with their hand and phone inside their pocket. Crazy.
It's NOT allowed to even have them on in school...BUT......they get away with it anyway. They even have ringers at an ultrasonic pitch that adults for some reason can't hear. I've seen that one. I can hear it when it's close, but not from across the room.
"Keep both hands where I can see them at all times." LOL
I think a better idea is to teach people that just because they can, doesn't mean they should.
AGREED 100%. It IS the better ideal....and I wish parents would give us some help with that one.