How to use cell phone jammers?

its true that a cell phone distracts a lot of people. places where attention is most important are the places that are most affected by their unbridled use. use of cell phone jammers however ,is unlawful in countries like USA, UK, Australia etc. you can also be fined for as high as $11,000 for each act of jamming in US. cell phone jamming is banned for private citizens but in some countries it could be done by businesses and government to maintain decorum and order and reduce nuisance due to excessive cell phone usage. so your school may first check with the local authority and then choose whether to install or not, a jammer in their premises. So, Use of cell phone jammers is ruled out for you. the alternatives that you can use is first a cell phone control where the calls received gets diverted into voicemail box and technically,the phone also does not gets jammed . cell phone alerter is used are used in hospitals to detect whether a signal exists and then the cell phone owner is asked to switch off the phone. a less technical solution is to circulate your views around your organisation and ask the employees to voluntarily keep the cell phone on vibration or switched off.