Why does our life need a cell phone jammer?

The popularity of mobile phones has made life easier and easier for relatives and friends. The use of mobile phones has also caused a lot of nuisance, among which the ringtones are annoying, especially in quiet public places. In addition, children use of mobile phone is also anxious parents and schools, mobile phone so that they don't like study, addicted to the game, make their failing grades, watch unhealthy content affects their physical and mental growth, this is dangerous, so the school can choose to install cell phone jammer prevent this kind of behavior.
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