Now you can close them politely and leave, or you can buy a cell phone jammer and leave them alone. Unfortunately, they are becoming more and more important because many people (especially prison guards) want to believe that new technology products can solve their problems. A group of prison guards not only submitted a petition to the FCC to set the rules, but also supported a bill requiring the FCC to allow the use of mobile phones in prisons.
In the four churches in Monterrey, an Israeli paperback-sized paper cell phone jammer is hidden between a Madonna-like painting and a statue of a saint. Japan allows the installation of cell phone jammers in public places such as theaters and concert halls, but only if you need to obtain a government-issued license. Last week, the French Minister of Industry approved a decision requiring the establishment of cinemas, concert halls and theaters, provided that emergency calls can be arranged.
CellAntenna desperately needs to perform gorgeous demonstrations in a controlled environment, but it does not seem to be too keen to submit engineering data to support the claim that mobile phones can go to jail. It can interfere with (a) authorized phones used by security guards, (b) surrounding public safety frequencies, or (c) people outside the prison. OTOH may not be able to squat down to solve the problem of the use of smuggled goods, but due to commercial communications and public safety issues, it is easy to become a cellular phone jammer with potential for development in the United States. There is no doubt that it will come out.