This would be coo to have.....
I would have my dad put it in his classroom, as then nobody could text while in class.... It is the perfect deterrent.
But seriously though, I would like to cough(buy)cough one of these. I found this one, but it doent look like it is that strong.
http://www.diytrade.com/directory/global/buy/products/1357041/Mobile_phone_jammer.html