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Content type: Report
First published in 2017, PI’s Guide to International Law and Surveillance is an attempt to collate relevant excerpts from these judgments and reports into a single principled guide that will be regularly updated. This is the fourth edition of the Guide. It has been updated it to reflect the most relevant legal developments until March 2024.The Guide aspires to be a handy reference tool for anyone engaging in campaigning, advocacy, and scholarly research, on these issues. The fourth…
Content type: News & Analysis
We have been fighting for transparency and stronger regulation of the use of IMSI catchers by law enforcement in the UK since 2016. The UK police forces have been very secretive about the use of IMSI catchers – maintaining a strict “neither confirm nor deny” (NCND) policy. In our efforts to seek greater clarity we wrote to the UK body which monitors the use of covert investigatory powers, the Investigatory Powers Commissioner’s Office (IPCO), asking the Commissioner to revisit this…
Content type: Examples
A British freedom of information tribunal ruled that for national security reasons police in England and Wales may refuse to say whether they are using Stingrays, also known as IMSI-catchers, which are capable of tracking thousands of mobile phones and intercepting their calls, text messages, and other data. In 2016, the Bristol Cable found that police forces had bought hundreds of thousands of these devices disguised in public spending data by the acronym CCDC. Privacy International, which…
Content type: Explainer
What is an IMSI catcher?
‘IMSI’ stands for ‘international mobile subscriber identity’, a number unique to your SIM card. IMSI catchers are also known as ‘Stingrays’.
An ‘IMSI catcher’ is a device that locates and then tracks all mobile phones that are connected to a phone network in its vicinity, by ‘catching’ the unique IMSI number.
It does this by pretending to be a mobile phone tower, tricking mobile phones nearby to connect to it, enabling it to then intercept the data from that phone…