The Challenges of Ensuring Effective Signal Blocking in Examination Halls

Examining the Potential Loopholes in Signal Blocking Devices

The conclusion of the annual college entrance examination in China, known as the Gaokao, has once again sparked discussions about the issue of students using mobile phones to cheat during exams. Many wonder why this problem persists despite the presence of handheld metal detectors and signal jammers in examination halls. This article aims to explore the potential loopholes in the current examination hall security measures, specifically focusing on the effectiveness of signal blocking devices.

Examining the Effectiveness of Signal Blocking Devices:

Signal jammers and metal detectors are considered essential equipment in examination halls. However, the fact that students are still able to use their mobile phones to send messages suggests that the signal blocking devices may have certain vulnerabilities. One possible explanation is that the signal jammers installed in the examination halls may not effectively block communication signals. This could be due to the proximity of nearby communication base stations, resulting in intermittent signal blocking. Another possibility is that the signal jammers in use may not be updated to the latest 5G version, rendering them ineffective against newer mobile technologies.

Choosing the Right Signal Blocking Device:

To ensure effective signal blocking in examination halls, it is crucial to select the latest 5G version of signal jammers. These devices should cover a wide range of signal frequencies, including 2G, 3G, 4G, and 5G, as well as the popular WiFi frequencies of 2.4GHz and 5.8GHz. Only by incorporating these frequencies can the signal blocking devices achieve optimal results.

Addressing Strong Signal Environments:

In cases where the surrounding environment has strong communication signals, it becomes necessary to employ signal blocking devices with higher power output. This ensures that the signals emitted by mobile phones are effectively blocked, preventing any unauthorized communication during exams.


While examination halls are equipped with signal blocking devices such as jammers and metal detectors, the persistent issue of students using mobile phones to cheat suggests potential vulnerabilities in the current security measures. It is crucial for examination authorities to invest in the latest 5G version of signal blocking devices that cover a wide range of frequencies, including WiFi signals. Additionally, in areas with strong communication signals, higher power output signal jammers should be employed to ensure effective signal blocking. By addressing these challenges, examination halls can maintain the integrity of the examination process and uphold fairness for all students.