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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: 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…