The Verge has a cool story about searching for Susy Thunder, a phone phreaker and social engineer.
Susan found her way into the hacker underground through the phone network. In the late 1970s, Los Angeles was a hotbed of telephone culture: you could dial-a-joke, dial-a-horoscope, even dial-a-prayer. Susan spent most of her days hanging around on 24-hour conference lines, socializing with obsessives with code names like Dan Dual Phase and Regina Watts Towers. Some called themselves phone phreakers and studied the Bell network inside out; like Susan’s groupie friends, they knew how to find all the back doors.
Check It Out: The Search for Infamous Phone Phreaker Susy Thunder