Mobile phone jammer
device designed to disrupt mobile network communication within an area
A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting them. Jammers can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptive because silence is expected, such as entertainment venues.
Because they disrupt the operations of legitimate mobile phone services, the use of such blocking devices is illegal in many jurisdictions, especially without a licence. When operational, such devices also block access to emergency services.
Legality
Since these jammers actively broadcast radio signals, they are illegal in many jurisdictions.
Australia: Illegal to operate, supply or possess unless the user has a PMTS C telecommunications licence under the Radiocommunications (Interpretation) Determination 2000.
Brazil: Illegal, but installation in prisons has been proposed.
Canada: Illegal under sections 4, 9, and 10 of the Radiocommunication Act, except by federal law-enforcement agencies who have obtained approval.
European Union: Illegal, according to the European Commission's "Interpretation of the Directive 1999/5/EC".
France: Legal until 2012 in cinemas, concert halls and performance venues, but illegal since 2012.
The public source identifies “Mobile phone jammer” as device designed to disrupt mobile network communication within an area. This brief keeps that definition visible, then builds a research path around Mobile, phone and jammer.
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This entry incorporates text from “Mobile phone jammer” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.