The working principle of a mobile phone signal jammers is based on emitting electromagnetic waves of a specific frequency. These electromagnetic waves match the frequency band used for mobile communication, forming a strong signal field in the target area. The power of this signal field is sufficient to cover the signal reception of mobile phones. Causing the phone to be unable to receive signals from the base station and unable to send signals to the base station.

Mobile signal jammers typically operate in mobile communication frequency bands such as GSM, CDMA, DCS, 3G, 4G, etc. The strong signal interference that will be emitted when the phone is within the signal coverage range of the jammer. Interference can lead to phenomena such as no service displayed on the phone, network searches, and frequent disconnections. So as to achieve the purpose of blocking mobile phone signals.

In terms of application, mobile signal jammers are mainly used in the following scenarios:

Exam room: During the exam, in order to prevent students from using their phones to cheat. The examination room will use a mobile signal jammer to block the mobile signal and ensure the fairness of the exam.
Prison: In order to prevent prisoners from engaging in illegal activities by contacting the outside world through mobile phones. Mobile signal jammers will be installed in prisons to cut off prisoners’ communication capabilities.
Meeting rooms and government agencies: In meetings or discussions that require confidentiality, in order to prevent information leakage. You may temporarily use a mobile signal jammer to block the incoming and outgoing signals from your phone.
Factories and warehouses: In certain places where work needs to be focused. In production workshops and warehouses, in order to avoid employee distraction or misuse of mobile phones, mobile signal jammers may be installed.
Except for the above application phone signal jammers can also be used in other places where the use of mobile phones needs to be prohibited or restricted. Such as gas stations, hospitals, etc.

It should be emphasized that the use of mobile phone signal jammers is legally regulated in many countries and regions. Because it may cause interference to emergency communication, public safety, and other normal mobile communication services. Possible interference to other devices when using a mobile signal jammer. In addition, with the development of technology, some new types of jammers can selectively block signals from specific numbers or operators, providing more precise interference control.