Mobile phone signals in some areas may be affected by shielding devices

It’s the time of the annual college entrance examination again. The 2022 National College Entrance Examination is scheduled to be held from July 7 to 9. For customers who have candidates taking the exam, there is good news: During the exam, each test site will activate a high-power signal jammer device. However, this will affect the wireless network quality of mobile phone users around the test site. You may experience difficulties such as frequent call failures, intermittent calls, and limited mobile Internet access. Please rest assured that everything will return to normal after the exam. Please inform others of this situation.

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Although this year’s college entrance examination was postponed to July 7 to 9 due to the epidemic, the corresponding measures to ensure the information security of the examination room have not been reduced. The operator has issued an announcement stating that it will activate the wireless WIFI signal jammer device during the exam in accordance with the requirements of the Education Bureau. This will affect the communication quality of mobile phone users around the school, and normal communication can only be restored after the exam.

The principle of mobile phone signal jammer

Let us first briefly introduce the principle of mobile phone signal jammer . When the cell phone jammer device is working, it will scan the frequency band at a certain speed, starting from the low frequency band of the forward channel (signal tower to mobile phone channel), and gradually scanning to the high frequency band, interfering with the mobile phone’s reception of information signals, so that the mobile phone cannot detect the base station signal, resulting in normal data transmission unable to establish a connection with the base station, thus being in a state of no signal and no service.

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The mobile phone signal jammer devices currently used in the examination room cover all 2G/3G/4G/5G frequency bands of the three major operators, and can completely shield WIFI signals and Bluetooth signals.