The working principle of a mobile signal jammer is based on sending signals of the same frequency as the base station to the mobile phone, thereby drowning out the signals received by the mobile phone from the base station. Causing the phone to be unable to make calls, send text messages, or use mobile data services normally. Usually used in places where the use of mobile phones needs to be restricted or prohibited.

The following are some practical application cases of mobile signal jammers

1. Examination supervision:
During the college entrance examination in China, in order to prevent cheating behavior. Some examination rooms may use mobile signal jammers to block candidates’ mobile signals to ensure fairness and impartiality in the exam. In 2015, a college entrance examination center in Wuhan, Hubei Province, China publicly displayed the use of mobile signal jammers to deter potential cheaters.

2. Prison management:
Some prisons in the United States prevent prisoners from communicating with the outside world through mobile phones. Mobile signal jammers will be installed inside the prison. For example, in 2018, the Federal Prisons Administration announced the deployment of mobile signal interference systems in federal prisons nationwide. To combat illegal mobile phone use in prisons.

3. Protection of Trade Secrets:
Some commercial enterprises may use mobile signal jammers in specific areas (such as research and development centers, conference rooms). Used to protect trade secrets and prevent information leakage. For example, in 2017, Samsung in South Korea installed a mobile signal jammer in a hotel near its research and development center to prevent employees from using their phones to leak sensitive information during meetings.

4. Religious venues:
Some religious places use mobile signal jammers during prayer or worship to maintain tranquility and respect. For example, in 2019, some temples in India used mobile signal jammers during religious festivals to reduce interference from tourists using their phones.

5. Military facilities:
To protect the security of military facilities and prevent sensitive information from being stolen. Some military facilities in certain countries use mobile signal jammers to block mobile signals in surrounding areas. For example, in 2020, Russia installed mobile signal jammers near training grounds in its western military region to prevent information leakage during military exercises.