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The phone system is insecure by design and has been forever.
Signal System 7 (SS7) was designed in the 1980’s and defines how telecommunications are switched worldwide. The mobile protocols MAP and CAMEL operate without authentication.
https://www.grc.com/sn/sn-556-notes.pdf
https://arstechnica.com/information-technology/2016/04/how-hackers-eavesdropped-on-a-us-congressman-using-only-his-phone-number/
The phone system is insecure by design and has been forever.
Signal System 7 (SS7) was designed in the 1980’s and defines how telecommunications are switched worldwide. The mobile protocols MAP and CAMEL operate without authentication.
https://www.grc.com/sn/sn-556-notes.pdf
https://arstechnica.com/information-technology/2016/04/how-hackers-eavesdropped-on-a-us-congressman-using-only-his-phone-number/