Blocking devices are designed to disrupt wireless communication channels. They create “white noise” at a certain frequency. If this frequency matches the one on which mobile phones operate, incoming and outgoing calls and SMS are blocked. Signal jammers affect telephone communications, other wireless devices, alarm systems, wiretapping, and remote recording.

Jammers are designed for a limited frequency range, so there are no universal devices that effectively affect all gadgets.

Equipment suppresses channels:

  • Satellite: BT Wi-Fi, Glonass,
  • Telephone standards 3G, 4G,
  • Navigation systems GPS, GSM,
  • Internet,
  • Radio stations.

Devices can operate within a certain radius or be directed. Specialized models show reliable results.

The different types of signal jammers

Despite the similar principle of operation, all devices can be divided into four large groups.

Stationary devices.

They are installed indoors or outdoors, are powered by the mains, and are large in size and weight. This is the most reliable protection method used in banks, government agencies, educational institutions and other places. They can be decorated as interior items and be invisible to outsiders.

Portable jammers for mobile phones.

These are autonomous gadgets weighing up to 500 grams. They are worn in pockets and handbags and activated when necessary. Batteries are enough for 1-3 hours of work. Reliability depends on the quality, power and correct settings.

GSM car jammers.

Installed the cigarette lighter. Most often, they are configured to block navigation systems and beacons. Their radius of influence does not exceed 10 meters.

Cases.

They are worn directly on the smartphone. They block not only calls and text messages but also the Internet. Even the operator cannot detect the location of the phone. It is reliable protection against spyware.

You can make a signal blocker with your own hands, but the functionality of such silencers is limited.

Installation Features

Suppose portable devices are enough to turn on by pressing a button. Then their effectiveness depends on the installation of stationary devices. In addition, the jammer should be invisible to outsiders. Choosing according to the range is important because a low-power device may be ineffective in large areas.

Do-it-yourself device installation is possible:

  • Make sure the mains’ power is off.
  • Find a place where the silencer will be invisible, and its signal will spread freely in all directions.
  • Tune the device to the same frequency used by the devices you want to disable.
  • Attach the device securely.
  • Plug in the electricity.
  • If you know their professionalism and disinterest, you can entrust the installation to third parties.
  • Scope of application
  • Cell phone jammers are used for the following purposes:
  • Privacy – attackers often use modern smartphones to collect information.

Security: Cellular jammers are installed at subway stations to prevent terrorist attacks.

The secrecy of the investigation and the protection of witnesses – in the pre-trial detention centre, the suspect’s communication with other people is blocked.

Order – in some cultural institutions and religious buildings, they jam the signal so as not to disturb the silence.

Honesty – when passing exams, students and schoolchildren do not have the opportunity to cheat.

Pros and cons

Communication blockers have a lot of advantages: they are easy to use, reliable, do not attract attention, and are inexpensive. The World Health Organization has not recorded the negative impact of silencers on human health. However, there are nuances of application that are important to consider.

The device can not only violate the right of other people to share information but also pose a threat. For example, a taxi driver’s car parked near the runway disrupts the work of dispatchers. You can install an announcement about blocking signals on the room’s doors.

Criteria of choice

Pay attention to important parameters to choose a cell phone jammer that will 100% satisfy your wishes.

Dimensions. Dimensions are especially important where it is necessary to hide the device from prying eyes or for use in a car or bag.

The radius of action. The distance at which the signal is jammed can be from 5 to several tens of meters.

Frequency. The frequency range must match that used on the blocked devices.

Food. The devices are powered by batteries and mains and may have a cigarette lighter socket.

Several antennas. Up to 5-6 antennas are installed in portable ones and 8-12 in stationary ones.

A signal jammer is the only way to protect yourself from information leaks and privacy intrusions. Even sophisticated and expensive spy equipment will neutralize a tight budget device.

Criteria of choice

Pay attention to important parameters to choose a cell phone jammer that will 100% satisfy your wishes.

Dimensions. Dimensions are especially important where it is necessary to hide the device from prying eyes or for use in a car or bag.

The radius of action. The distance at which the signal is jammed can be from 5 to several tens of meters.

Frequency. The frequency range must match that used on the blocked devices.

Food. The devices are powered by batteries and mains and may have a cigarette lighter socket.

Several antennas. Up to 5-6 antennas are installed in portable ones and 8-12 in stationary ones.

A signal jammer is the only way to protect yourself from information leaks and privacy intrusions. Even sophisticated and expensive spy equipment will neutralize a tight budget device.

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