It is easy to buy signal jamming equipment on the Internet that can disturb wireless frequency bands such as mobile phones, GPS signals, Wi-Fi systems, etc. The jammer works by covering the radio tape to be captured in a noisy area. Because they are inexpensive devices not approved by the Federal Communications Commission (FCC), they often emit noise in other frequency bands. U.S. cell bands are adjacent to the 800 MHz band where Nextel is deployed, some public safety, government and commercial systems, so these signals are likely to interfere with the target band.
Signal jammers are used in schools, restaurants and other places where homeowners want to prevent people from making and receiving calls indoors. Recently, prisons are considering deployingmilitary jammer to prevent prisoners from using cell phones in prisons. It is illegal to own a cell phone in prison, but again, this does not seem to prevent prisoners from owning a cell phone.
Recently, many prisons have come together, asking the FCC to allow it to be trapped inside a wall pending a verdict. There are many problems with this "solving" method, the most important of which is that the guards will not be able to use their cell phones, and if the prison radio frequency is near one of the cell phone groups, it is likely that they will not even be able to use the interphone. If paramedics, police or firefighters are called into the prison and their radio system is in the 800 MHz band, they are likely to lose communication once they enter the prison door.
As a mobile phone user, I want to be able to use my mobile phone almost anywhere. In unpopular places such as doctors' offices, theaters, and some restaurants, a notice board is usually displayed to inform people who enter not to use cell phones indoors. Mel Samples, who runs a wireless consulting company in Los Angeles, has worked closely with us for many years to better connect with his use of mobile phones in prison and said he is currently considering whether to Military signal jammers was installed in the prison.