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In early 1971, a Vietnam War veteran named John Draper discovered with his friend Joe Engressia that a toy whistle that was, at the time, packaged in boxes of Cap’n Crunch could be easily modified to emit a tone at precisely 2600 hertz, the same frequency that was used by AT&T long lines to indicate that a trunk line was ready and available to route a new call. This would effectively disconnect one end of the trunk, allowing the still-connected side to enter an operator mode. This resulted in, among other things, the ability to place free phone calls to anywhere in the world, and operator-like control over the phone system.