What is an IMSI catcher? An IMSI catcher is a device that can be used to intercept and track mobile phone calls and text messages. IMSI catchers are also known as cell site simulators or stingrays. They are often used by law enforcement and intelligence agencies to track and monitor suspect mobile phone activity. IMSI catchers can be used to eavesdrop on conversations, track the location of a mobile phone, and even intercept text messages.
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