Finally we have a way to protect us from cell phone noisy, that is called cell phone jammer. The cell phone jammer is a kind of device used to block the signal of the cell phones in a certain area, so the cell phones of that area cannot send or receive any signal from the base station. It is very good for library, concert, hospital, prison, public place like restaurant, cinema and so on.... I have found a very good supplier of this kind of jammer: http:http://tinyurl.com/oocl9ak it is a leading jammer supplier that offering all kinds of jammer: cell phone jammer, GPS jammer, Wifi jammer, Audio jammer, RF jammer, UHF/VHF jammer and so on. It has many years of experience in selling jammers, the quality is very good.