This is not surprising. Zhou Shengjun, a communications expert and founder of Xianzaoban, explained to Southern+ reporters that 5G is a newly launched network standard in recent years, using some new radio frequency bands, and many old models still do not support shielding 5G signals. According to the division of 5G frequency bands, China Telecom and China Unicom's 5G mainly use 100MHz spectrum resources in the 3.5GHz band, while China Mobile mainly uses 160MHz spectrum resources in the 2.6GHz band and 100MHz spectrum resources in the 4.9GHz band. The working principle of Signal cell phone jammer is that In the frequency band of the corresponding mobile network, use greater power to release stronger signals, Cell Phone Blocker Circuit Explanation to suppress interference to normal signals, to achieve the purpose of shielding.
Since the mobile phone receives signals through the propagation of electromagnetic waves, the base station establishes a connection with the mobile phone by transmitting radio waves, so as to achieve the purpose of voice communication. Therefore, the interference of electromagnetic waves can adversely affect the mobile phone. The phone shows 4G signal, it is normal to dial 3G or 2G signal! It is not caused by the failure of the mobile phone or the failure of the base station. The following explains why this phenomenon occurs: 4G has only one data channel (commonly known as the Internet channel); 2G and 3G have two channels, data channel and voice channel. So both 2G and 3G can surf the Internet and make calls, while 4G can only surf the Internet because it has only one data channel. In the early days of 4G, a solution called CSFB (Circuit Domain Fallback) was developed in order to meet the need for mobile phones to make calls when using the 4G network. 4G network falls back to 2G or 3G network and starts making calls. However, this technology has a disadvantage, that is, you cannot access the Internet when making a phone call, so it is very inconvenient for some enterprise users. So when we buy some Cell Phone Blocker Circuit Explanation , we must understand the rules and principles of using some signals.
