"IMSI-catchers are invasive mobile surveillance tools that simulate phone towers. Devices in the area unwittingly connect to the IMSI-catchers, whereby unique information - such as a device's international mobile subscriber identifier (IMSI) number - is logged, alongside precise geographical locations at the time of interception. Phone call and text message metadata can also be exposed, with some equipment capable of intercepting the content itself."
"Since multibillion-pound tax gaps have put HM Revenue & Customs (HMRC) under pressure to increase the volume of its tax investigations in recent years, the agency's Fraud Investigation Service handled more than 3,000 criminal and civil cases in 2024-25. With millions of people to monitor annually, and £50bn to claw back, it can only find substantial discrepancies through intelligence, which requires vast data collection."
"HMRC quietly acquired "data collection" equipment for surveillance, from controversial IMSI-catcher manufacturer Cellxion, as far back as 2021. The contract with Cellxion began in 2021 with the procurement of a "surveillance system" worth £330,460. This was required to "upgrade" its "existing capabilities", indicating that HMRC might have had similar equipment in the past."
The UK's tax authority HMRC has been acquiring surveillance technology to support its expanded tax investigation operations. Facing pressure to address £50 billion tax gaps, HMRC's Fraud Investigation Service handled over 3,000 cases in 2024-25. The agency contracted with Cellxion, an IMSI-catcher manufacturer, beginning in 2021 for a £330,460 surveillance system upgrade. IMSI-catchers are invasive tools that simulate phone towers, capturing device identifiers, precise locations, and potentially call and text metadata from nearby phones. Unlike visible law enforcement surveillance capabilities, HMRC's intelligence gathering has remained largely unexamined publicly, enabling the agency to conduct extensive data collection operations with limited transparency.
#hmrc-surveillance #imsi-catcher-technology #tax-investigation #mobile-phone-tracking #government-oversight
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