The Dean of the School of Electronics and Information and the Dean of the School of Microelectronics of South China University of Technology also said in an interview with Nanfang Daily that the current communication technology is constantly being upgraded, and the 5G signal format is different from the original 4G format. It is also possible that older model Short Range Cell Phone Blocker devices do not fully interfere with the 5G signal. "Chutian Metropolis Daily" reported in 2015 that before the college entrance examination that year, Wuhan City updated the mobile phone signal jammers, metal detectors and other equipment in all test centers. Among them, cell phone jammer has been upgraded to block the latest 4G signals that have been activated in some domestic cities, and the WiFi signals of test sites will also be blocked. "At present, it is doubtful whether the existing signal jammers in some test centers can completely block the signals of all operators." On June 9, a high school teacher in Wuhan introduced that the school will turn on the mobile phone in the classroom every time the big test. jammers, but she and her colleagues have had this experience many times: using mobile phones of different operators near the classroom, some have no signal at all, and "some still have signal."
Mobile phones have become the most basic communication tool for people in modern society, and Short Range Cell Phone Blocker is sought after for personal or work reasons. The radio management department stated that: a mobile phone signal jammer is essentially a radio transmitter that not only interferes with the frequency of normal signals, but is also harmful to human health. It is strictly forbidden to buy, sell, install and use without authorization. But the reporter's investigation found that mobile phone jammers can be bought and sold at will in the Chengdu market! The lag of relevant laws and regulations has also become the fundamental reason for the emergence and public trading of mobile phone blockers. Yesterday, the reporter entered the words "mobile phone signal jammer Chengdu" in the Google search bar, and the query results were about 34,800. On one website, the reporter easily found the contact's phone number. The company's website also offers services such as placing orders, paying bills online, and even home delivery. Yesterday afternoon, according to the address provided by the contact person, the reporter came to the office of about 20 square meters on Yusha Road where the company is located. The staff took out a small and exquisite conference cell phone signal jammer to demonstrate to reporters: he skillfully unscrewed the four nuts on the router-shaped cell phone jammer, and placed the signal transmitter in the corresponding position. Tighten the nut again, "It will now take almost a minute to turn on the switch (to block the signal)."
