The working principle of a cell phone jammer is similar to that of a radio jammer, and the signal it sends is the same as the working frequency of the mobile phone. This will cause enough interference to prevent the call from connecting to the phone. There are currently two types of cell phone jammers. The first category is generally smaller devices, used to block the signal sent from the cell phone tower to each cell phone. The blocking frequency is between 800 MHz and 1900 MHz. Most devices using this technology can block signals within 30 feet. Cell phones within this range will not display any signal.

Now you can politely tell them to shut up and go, or you can buy cell phone jammers and turn them off yourself.

Fortunately, because many people (especially prison guards) want to believe that new, high-tech products can solve their problems, they continue to gain momentum. Not only have many prison administrators filed a regulatory petition with the FCC, but they are supporting a bill that requires the FCC to allow the use of cell phone GPS jammers in prisons.

In the four churches of Monterrey, Israeli-made cellphone jammers (the size of a paperback book) are shamelessly hidden in the paintings and statues of Madonna's saints.

Japan allows the installation of jammers in public places such as theaters and concert halls, but only if they obtain a permit issued by the government. Last week, the French Minister of Industry approved the decision to allow the installation of cinemas, concert halls and theaters - as long as there are relevant regulations, so that emergency calls can still be carried out.

Tokyo-based Medic Inc. sold thousands of Wave Wall gsm jammers before the government stepped in and regulated their use through live shows.

Catholic Margarita Escobedo (Margarita Escobedo) attends church at least twice a week and volunteers in San Genaro. She said she would welcome disruptors into the ward, where cell phones are getting boring.

GPS Jammer is usually small devices that can plug into lighter ports on vehicles and send out radio signals, which can cause excessive power or stifle many weak signals, such as GPS or other signals.