|The answer? John Draper A.K.A. Cap'n Crunch|
In 1972, John got a call from a kid who turned him onto a toy whistle fished out of a Cap'n Crunch cereal box. John discovered that with the whistle and a "blue box" (tone generating device), he was able to gain internal control of the phone company's long distance switching equipment.
The trick no longer works. But something else might.
For more hacker culture identification...the whistle blew at 2600 Hz.
Also...I believe the Cap'n was the first convicted hacker. Title 18, Fraud By Wire.