How does the phone network work? Who can see your data? Who can listen to your calls or read your SMS? Who can examine who you call or who calls you? What meta data is collected? What about your internet actions? How much of that can be seen by third parties? Who are the possible third parties? What about VOIP/SIP?

This is a deep dive into the architecture of the Public Switched Telephone Network (PSTN). A system that Kevin Mitnick, master hacker has attacked for so many years because he understood it so well. Now I will let you understand it too.