In our life, smart phone is very popular, the use of mobile phones will bring us some noise, a loud call is not polite behavior, for this kind of behavior, can I use the cell phone jammers to stop? The phone jammer is also known as a phone blocker or jammer, which is a device that prevents wireless connections in its environment. This creates an artificial corner, which prevents the use of mobile phones and smartphones. The mobile jammer is mainly aimed at mobile phone networks, but wi-fi and GPS are also affected. The range of the cell phone jammer depends on the model. A device that affects only a 10-meter radius, but also has a model that affects more than 40 meters. For the army and the government, there are also models that interfere with radio signals within a range of thousands of meters.