A group of academics have found three new security flaws in 4G and 5G, which they say can be used to intercept phone calls and track the locations of cell phone users.

The findings are said to be the first time vulnerabilities have affected both 4G and the incoming 5G standard, which promises faster speeds and better security, particularly against law enforcement use of cell site simulators, known as “stingrays.” But the researchers say that their new attacks can defeat newer protections that were believed to make it more difficult to snoop on phone users.

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