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(also mobile jammer, blocker)

Jammer definition

A jammer is a mobile communications device that transmits on the same frequency band as a cellphone. It generates significant interference with cell towers and prevents the transmission of mobile phone signals and calls. Users may experience reduced signal reception, and jammers are typically undetectable by law enforcement agencies. They are most typically utilized in settings where complete silence is required. Using these blocking devices, especially without a license, is unlawful in many countries since they interfere with the functioning of mobile phone services.

How jammers work:

  • Signals from cell phones are transmitted to base stations to facilitate communication. Based on the cell phone's location, the signal will be received by a different cell tower.
  • Cell towers distribute their workload by focusing their attention on particular regions. When traveling, your cell phone will send signals to different towers depending on where you are.
  • Jammers send radio frequencies to the same tower you’re connected to. A jammer mimics your cell phone signal and overpowers its cellular frequency.
  • The signals from your cell phone and the jamming device eventually collide. This interrupts cell phone tower connectivity.

Benefits of a jammer:

  • Wide application. Jammers are widely used in universities, prisons, churches, schools, government agencies, libraries, or hospitals.
  • Aids in concentration. Even at meetings or when talking with important investors, for example, people still tend to answer calls. A jammer prevents ringing phones from interrupting important discussions.
  • Security reasons. Blocking cell phone signals can avert terrorist attacks.
  • Message. Callers will hear “the phone you are trying to reach is not available right now“ instead of “the phone you are trying to reach is switched off” when they call another person.

Restrictions and dangers of a jammer:

  • A person might not be able to dial 911 when facing an emergency because the signal is blocked.
  • Certain jammers also block GPS, Bluetooth, and Wi-Fi signals.
  • Jammers can pose significant risks to public safety communications.