You probably already know: your cell phone is a tracking device. Your phone’s SIM uses a globally-unique, permanent identifier to authenticate and connect to the cellular network. These identifiers are known as IMSIs, and they leave you vulnerable to privacy attacks. One attack method uses what’s known as an IMSI Catcher, or Stingray, to simulate a valid cell tower signal that tricks nearby phones to connect and offer their IMSI. Fixes to this specific attack, even in 5G, are years away. In perhaps an even more concerning attack – mobile carriers themselves have been known to aggregate, analyze, and sell the IMSI and mobile data they collect.

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