The Blue Box: How a Toy Whistle Hacked AT&T and Helped Launch Apple

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A blind seven-year-old with perfect pitch and a plastic whistle from a box of Cap'n Crunch could both do the same astonishing thing: reset a long distance line on the world's most powerful phone network. This episode explains why. AT&T's automated switches talked to each other with musical tones sent down the same channel as the caller's voice, and a single 2600 hertz tone told a distant machine that the caller had hung up. Bell Labs even printed the frequencies in the Bell System Technical Journal in 1954 and again in 1960.

The blue box turned that flaw into a tool. A caller dialed a toll-free number, blasted 2600 hertz to seize an open trunk, then keyed in any destination while the local office stayed oblivious. The episode follows the phone phreaks who explored the network, the 1971 Esquire article by Ron Rosenbaum that exposed them, the two Californians named Steve who sold boxes from a dorm room, and the surveillance and digital switching that finally closed the loophole.

Joe Engressia, later known as Joybubbles, found the reset tone by whistling into a receiver, and John Draper took the name Captain Crunch from the cereal whistle.
Builders used oscillator chips from RadioShack and hid circuits inside hollowed-out TI-30 pocket calculators.
Steve Wozniak used his box to call Vatican City posing as Henry Kissinger, while Steve Jobs sold the devices for up to $150 each.
Bell flagged unusually long calls to toll-free numbers, then printed illegally dialed destinations in red ink as court evidence.
Out-of-band signaling moved the control tones to a separate data link, and AT&T wrote off billions in analog switching equipment.

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