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Content type: Explainer
5th May 2021
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 to…