Handy jammers vary in different countries
Cell phone jammer laws vary around the world.
Japan allows jammers to be installed in public places such as theaters and concert halls as long as they have a government-issued license. The French industry minister had made a decision to install cinemas, concert halls and theaters as long as emergency calls are not possible.
Chinese and Indian schools use cell phone jammers to stop scammers. Mexico allows disturbances in churches and hospitals. And the main customers there are banks, which want to prevent would-be thieves from communicating with their employees and the Mexican government plans to use in prison. And Pakistan allows blocking in banks and libraries.
Canada considers it permissible to block in a similar situation. But Industry Canada, which oversees the country's telecoms business, has chosen to oppose the move, saying the devices could violate individual liberties and harm public safety by weakening communications with law enforcement and security agencies could.
Dozens of countries, including Canada, Mexico, Germany, New Zealand, Norway, Turkey and others, allow police or prison officials to use Jammer.
Most countries, including the US, use jammers to thwart cellphone-triggered bombings against government leaders. When President Obama walked down Pennsylvania Avenue after his inauguration, cell phones were all jammed in the area. The US Military use jammers to stop roadside bombings in Iraq. Of course there are other uses of jammers.
Netline officials sold their first jammers in 1998 and say they are selling thousands of jammers each year and are expanding their operations around the world.
They are far from the only manufacturer. These devices are sold all over the world, and dozens of suppliers sell them on the internet.
Headquartered in Tokyo, Medic sold thousands of Wave Wall Jammers for use in live venues. Commuters are still using cellphone jammers to sleep chatting train passengers.
In Scotland, Ronnie McGuire, owner of electrical and electronics engineering services, imported Taiwan-made cell phone blockers and sold them to hotels, restaurants and bars until local newspapers reported illegal activity in the UK.
McGill said he would still import Taiwanese gear but only export it to countries that are allowed to export.