We know that today's smartphones are equipped with a GPS positioning navigation system, so mobile phone positioning is relatively easy. Since each mobile phone has a separate identification number, when transferring from one location to another, the mobile phone location switching will be more Fast, of course, using a dedicated GPS can do this faster and with a clearer, more accurate location.
However, these signals can easily be blocked or superimposed. In this case, we need jammers, so-called wifi jammers or wifi interceptors. These jammers only interfere with the above signals and will not affect other devices around. The jammer transmits the same radio wave and suppresses it by signal to ensure that the mobile phone can no longer establish contact with the radio cell, and thus cannot receive SMS mail or telephone notification.
This type of equipment is small, only ten feet in size, and is conveniently placed in a pocket. In some cases, such as in a movie theater or in a reception room, cell phone calls can cause interference. Even in some of the more rigorous military bases, it is forbidden to make cell phone calls. Therefore, wifi jammer may be placed in prisons to prevent prisoners from using smuggled phones by blocking radio waves.
When using wifi jammers, we must pay attention to the use area and the way of use. Do not use some illegal activities, because if they are not operated properly, they also have security risks. They will hinder emergency calls. Various styles and different frequency bands are provided here. Wifi jamming devices, the price is between tens and hundreds of euros.
In Germany, the government authorities may carry out some projects, such as the above-mentioned use of jamming equipment in prisons to block the signals of detainees using mobile phones; in France, jammers are also often found in public places such as theaters and cinemas. Many people agree to use wifi jammers. They have good reason: when the mobile phone rings the atmosphere that disrupts the performance, it is very annoying. Installing a public telephone in the cinema can effectively prevent someone in the movie theater from having a heart attack. Attacks, and because the phone signal is poor, the ambulance can not be summoned immediately, you may die.