Have you heard of cell phone jammer? Blocking communication between cell phones. It is an obsolete device that is blocking the transmission of signals between cell phones and base stations. This leads to severe disruptions in communication between caller and recipient. Effectively blocks the transmission of signals including 3G, CDMA, GSM, and PHS. I cannot make or receive calls. It can cause more problems than improper use. Everyone in these industries can be convinced.
Cell phones operate in different frequency bands in different countries. It typically uses the GSM 900 and 1800 bands in locations like Asia. The US uses the 850 and 1900 MHz bands. Using different frequencies makes it difficult to have interference for all frequencies. A suitable smartphone jammer is important, depending on the frequency you need to cut off. Cell phones are also blocked in theaters and local trains. Cinemas and libraries use these products. I read a book quietly.
With the government's license, Japan can install interfering radio waves in public places such as theaters and concert halls. This device violates personal freedom. We have found that this can affect public safety. He sells jammers and says he is expanding his business around the world. Sometimes I forget to hang up my cell phone. For many people, cell phones are a necessity. WiFi jammers are popular when cell phones are annoying.