The most famous phreak of all time, who discovered that the whistles that came in boxes of Captain Crunch
cereal emitted perfect 2600 Hz tones. 2600Hz was the frequency used by Bell'
s switching systems to indicate a trunk being freed. By sending 2600Hz after making a call to a WATs line after they hung up, you could
trick the phone network into giving you another dial tone, on which you are not charged. You could then send MF tones to dial your second (free) call. Steve Wozniac, co-founder of apple computer supposedly used this
trick to prank the pope without paying anything or being at all traceable. None of this
stuff works anymore, of course.
