Block Private Calls To Cell Phone
There is no way to stop it. Block Private Calls To Cell Phone is the so-called signal jammer, which can block all communication signals and cannot be prevented. Effectively shield CDMA (China Telecom), GSM (China Mobile, China Unicom), SCDMA (Netcom Dalingtong), DCS (1800MHz), PCS (1900MHz), PHS (Telecom PHS), 3G mobile phone signals, WIFI and 4G mobile phones Signal waits for all communication signals. The principle of mobile phone (radio communication) is: within a certain frequency range, the mobile phone and the base station are connected by radio waves to complete the transmission of data and sound with a certain baud rate and modulation method. In view of the above communication principle, the cell phone jammer scans from the low-end frequency to the high-end frequency of the forward channel at a certain speed during operation. This scanning speed will cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent by the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone manifests as the phenomenon of searching the network, no signal, no service system, etc.
Hearing that mobile phone signal jammers are being sold on the Internet, Mr. Zhang, a citizen, felt a little strange: "During the earthquake, everyone's mobile phones couldn't get through, and everyone knew how anxious they were at that time." Time. If these Block Private Calls To Cell Phone can be bought at will online, it is with ulterior motives or ulterior motives. Liars use it. If you can't get through in an emergency, you will definitely be anxious! In addition, if these devices are secretly used in places such as commercial competitors, there will be huge losses to individuals and businesses. In addition, Huang Hengyou, the head of the Chengdu Radio Monitoring Station, also said yesterday that the power of the mobile phone signal jammer should be at least 2.5 watts, and there is more than one floor on one floor, and the signal is continuous, and the radio wave transmission power far exceeds the environmental protection regulations. The radiation will have an impact on people, which does not meet the relevant regulations of the Ministry of Health.