Search
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…