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Born blind in 1949, a 7-year-old bypassed AT&T to make free calls for 14 years by whistling a 2600Hz tone. Engineers took two decades to catch him before he became a Buddhist monk named Joybubbles.
Because @[email protected] was unable to properly add sources, I helped them out by looking for something on Wikipedia:
The tone was discovered in approximately 1957,[9] by Joe Engressia, a blind seven-year-old boy. Engressia had perfect pitch, and discovered that whistling the fourth E above middle C (a frequency of 2637.02 Hz) would stop a dialed phone recording. Unaware of what he had done, Engressia called the phone company and asked why the recordings had stopped.[10]