IMSI catchers are an enormous invasion of your right to privacy – they trick all mobile phones within a certain area into giving up information about their owner – even during what the police might describe as ‘targeted’ operations. Some IMSI catchers can also block service so you can no longer use your phone to make or receive calls and text messages – even for emergency calls. Some IMSI catchers can even re-route or edit communications and data sent to and from your phone.
This means others can read or listen to your personal communications. Some IMSI-catchers can ‘intercept’ your text messages, calls and internet traffic. Measuring the strength of the signal from different locations permits an ever-more precise determination of the phone’s location.Ĭan an IMSI catcher snoop on my calls and text messages? Once your phone has been tricked into revealing its IMSI, the IMSI catcher can determine your phone’s general location by measuring the strength of the signal from the phone. How does an IMSI catcher find out my location? Once the police have your IMSI, they can easily determine your identity. Once your phone is tricked into connecting to an IMSI catcher, it reveals this unique number. “IMSI” stands for “International Mobile Subscriber Identity”, a number unique to your SIM card. How does an IMSI catcher find out my identity? However, documents obtained by Bristol Cable show that the following police forces have either purchased the technology or allocated money to do so: This means that the police are refusing to explain to the public how they could use these invasive devices to secretly access data from our mobile phones. The police “neither confirm nor deny” that they use IMSI catchers.
They can even be used to monitor your calls and edit your messages – and you wouldn’t even know it was happening. IMSI catchers are indiscriminate surveillance tools that could be used to track who attends a political demonstration or a public event like a football match. An IMSI catcher is an intrusive piece of technology that can be used to locate and track all mobile phones that are switched on in a certain area.Īn IMSI catcher does this by ‘pretending’ to be a mobile phone tower - tricking your phone into connecting to the IMSI-catcher, and then revealing your personal details without your knowledge.
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