Geeta Dayal in Slate:
In his new history of phone phreaking, Exploding the Phone, engineer and consultant Phil Lapsley details the story of the 1960s and 1970s culture of hackers who, like Tufte, devised numerous ways to outwit the phone system. The foreword of the book is by Steve Wozniak, co-founder of Apple—and, as it happens, an old-school hacker himself. Before Wozniak and Steve Jobs built Apple in the 1970s, they were phone phreaks. (Wozniak’s hacker name was Berkeley Blue; Jobs’ handle was Oaf Tobar.)
In 1971, Esquire published an article about phone phreaking called “Secrets of the Little Blue Box,” by Ron Rosenbaum (aSlate columnist). It chronicled a ragtag crew sporting names like Captain Crunch and the Cheshire Cat, who prided themselves on using ingenuity and rudimentary electronics to outsmart the many-tentacled monstrosities of Ma Bell and the FBI. A blind 22-year-old named Joe Engressia was one of the scene’s heroes; according to Rosenbaum, Engressia could whistle at exactly the right frequency to place a free phone call.
Wozniak, age 20 in ’71, devoured the now-legendary article.