The Captain Crunch

One day John Draper noticed that some blind kids, named Dennie and Jimmie, were using the whistle from a “Cap’n Crunch” box to make free long distance telephone calls. They glued one of the holes shut in the whistle, and then blew it into the telephone. The modified whistle produced a pure 2600 Hz tone, which was the standard used by telephone electronics to signal that a call was over. When the telephone system heard the whistle it stopped all long distance charges, even though the call continued until one of the parties hung up.

Source ::>> http://www.livinginternet.com/i/ia_hackers_draper.htm
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