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Use jammers to build a standardized test site to ensure safety inspections. Developing technology. It can interfere with the 3G frequency band. You can continue to block mobile phone signals over a wide area. There are many where you need it. You can stop the criminal consciousness. For basic GSM signals, phone jamming devices are a good choice to avoid phone noise. The operators of theaters and the like are signal blocker who are strongly demanding the development of effective countermeasure technology.
It is true that science and technology have made great strides in the last few years. Interfering with radio waves is called "jamming". Widespread jamming. Forcibly out of range of mobile phone radio waves, mobile reception will not be possible. You can repel mobile phones that violate manners. It's easy to use, just press the switch. It is a gps jam that can be purchased on the market.