In order not to break the quietness and seriousness due to pesky mobile rings, cell phones are prohibited from using in many places like the meeting room, tribunal, and classroom and so on. What's more, cell phones are strictly prohibited in those confidential places to avoid the leak of the confidentiality. And you cannot let everybody keep their mobile phones off. Here, mobile phone jammer
, cellphone signal jammer can help you. With it, you can solve this problem easily.