Online marketplaces sell “signal blockers” that promise to stop a neighbour’s camera, a tracker, or a smart device in the next room. For a householder worried about privacy, or for someone who has just read that wireless alarms can be disrupted, the idea can seem tempting. In the UK, using such a device is a criminal offence, and the legal position is set out plainly by Ofcom and in the Wireless Telegraphy Act 2006.
What counts as a jammer
Ofcom describes a jammer as any apparatus designed, constructed, adapted or intended to be used to block or weaken the reception of wireless telegraphy. It explains that jammers usually work by emitting electromagnetic radiation at a frequency, intensity and proximity that overwhelms a receiver, obstructing or degrading the wanted transmission. Because a jammer works in that way, Ofcom says it is not classed as “radio equipment”. Wi-Fi, mobile networks, GPS and the radio links used by many wireless alarms and cameras all use wireless telegraphy, so they fall within the description.
Using one is an offence across the UK
Section 68 of the Wireless Telegraphy Act 2006 says a person commits an offence if they use apparatus for the purpose of interfering with wireless telegraphy. The section applies whether or not the apparatus is itself wireless telegraphy apparatus. On summary conviction the penalty is imprisonment up to the general limit in a magistrates’ court, or a fine up to the statutory maximum, or both; the section says the 12-month reference is read as six months in Scotland and Northern Ireland. On conviction on indictment it is imprisonment for up to two years, or a fine, or both. Ofcom summarises the position as up to two years’ imprisonment and an unlimited fine.
The offence turns on using the apparatus for the purpose of interfering with wireless telegraphy. A householder who wants privacy from a neighbour’s camera should use lawful routes, such as those covered in the site’s guide to a neighbour’s camera pointed at your property.
No licence is available
Ofcom states that it does not authorise or licence the use of jammers. Various laws allow jammers to be used in special cases, such as in prisons and by the police and other agencies, but those are not routes open to a private householder. Ofcom does sometimes issue innovation and trial licences for research, testing or demonstration, but those authorise controlled tests, not household use.
Selling and importing them is a separate offence
Ofcom explains that jammers are subject to the Electromagnetic Compatibility Regulations 2016, which require equipment not to affect the operation of radio communications. Making non-compliant equipment available on the market, whether for payment or free of charge, is an offence. A person who manufactures, imports or distributes non-compliant equipment may, on conviction, face an unlimited financial penalty and/or three months’ imprisonment. Ofcom’s Spectrum Compliance team carries out investigations to combat the selling of jammers, and it asks that suspected non-compliant radio equipment be reported to its market surveillance team.
This has a practical consequence for buyers: an online listing for a “signal blocker” is not evidence that the product is lawful to own or use. A householder should treat any such advert as a warning rather than a product recommendation.
What jamming means for choosing a wireless alarm
The legal position also explains why security guidance for wireless systems focuses on resilience rather than on countermeasures a householder could deploy. Choosing equipment that reports a lost connection, and understanding how a system behaves when its communication fails, are covered in the site’s guides to alarm communication failures and building a response chain. Standards questions are in BS EN 50131 alarm grades explained.
Frequently asked questions
Is it legal to own a jammer for personal use? The offence in section 68 concerns using apparatus for the purpose of interfering with wireless telegraphy. Separately, Ofcom says making non-compliant jammers available on the market is an offence under the EMC Regulations 2016.
Can Ofcom license a jammer for a home? Ofcom says it does not authorise or licence the use of jammers.
The bottom line
Across the UK, using a signal jammer to block Wi-Fi, GPS, mobile or camera signals is an offence under section 68 of the Wireless Telegraphy Act 2006, punishable on indictment by up to two years’ imprisonment or a fine, and Ofcom says it does not licence their use. Selling or supplying non-compliant jammers is a separate offence under the Electromagnetic Compatibility Regulations 2016. Householders with privacy concerns should use lawful routes instead. This is general information, not legal advice.