My Neighbor Has A Cell Phone Jammer

Let's look at the facts first. On June 7, the first day of the college entrance examination, some netizens broke the news that in the afternoon mathematics examination room, some candidates were suspected of uploading a picture of a math paper of the new national college entrance examination in 2021 to the Internet. The screenshot of the online transmission shows that the uploaded math test paper shows that the time is 15:46 on June 7, 2021, and there is still 1 hour and 14 minutes before the end of the college entrance examination mathematics. An article on the Internet stated that on June 8th, the Huangpi District Admissions Office responded to this matter, saying that perhaps because of a loophole in My Neighbor Has A Cell Phone Jammer, the examinee was able to upload examination questions on his mobile phone. But for this statement, it feels impossible. First of all, 5G signals cannot have such loopholes. Let's first understand the working principle of the mobile phone signal jammer. We know that mobile phone signals are actually electromagnetic waves emitted by base stations, and the frequency of battery waves emitted by different base stations is different, but the baud frequency of these electromagnetic waves is fixed, and anyone can check the frequency. cell phone jammer

Mobile phone signal jammers interfere with these electromagnetic waves, making it impossible to analyze when the mobile phone receives them. Specifically, it scans from the low-end frequency of the forward channel to the high-end at a certain speed. This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone is manifested as the phenomenon of searching the network, mobile phone no signal, no service system and so on. The working principle of My Neighbor Has A Cell Phone Jammer is to shield by interfering with the mobile phone signal of the designated band. Most mobile phone jammers on the market can only shield the mobile phone signal of 900---1800MHZ, and the receiving and transmitting frequency of the mobile phone is 800-1900MHZ, which is much larger than the mobile phone signal jammer. The shielding range of the mobile phone, so as long as the mobile phone's receiving and transmitting frequency is adjusted to not within the shielding frequency range in the mobile phone settings, the mobile phone signal can be received normally. In addition, there are other ways to crack the mobile phone signal jammer, such as someone using a wifi hotspot nearby to provide wifi function to candidates in the examination room.