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Phreaking is a slang term coined to describe the activity of a subculture of people who study, experiment with, or exploit telephones, the telephone company, and systems connected to or composing the Public Switched Telephone Network (PSTN) for the purposes of hobby or utility. The term "phreak" is a portmanteau of the words "phone" and "freak." It may also refer to the use of various audio frequencies to manipulate a phone system. "Phreak", "phreaker", or "phone phreak" are names used by and towards people who participate in phreaking. It is often considered similar, and therefore grouped in category with computer hacking. This is sometimes called the H/P culture (with H standing for Hacking and P standing for Phreaking).

History of phreaking


The precise origin of phone phreaking is disputed, as there is no one defining event when it started. One could argue that the inception of the telephone could be the origin of phreak-like experimentation. There are also reports of people playing with some of the first automatic switching equipment back in the 1920s. Modern day phreaking, however, is more likely to be traced to the United States in the mid-to-late 1950s when AT&T started introducing fully automatic direct-dial long distance and certain forms of trunking carriers which used in-band signalling. People started playing with the phone system, in a way similar to the way modern day hackers play with the Internet.

Early phreaks, such as Joybubbles ( Joe Engressia), and Bill from New York started developing a rudimentary understanding on how the phone system works. Joybubbles taught himself to whistle a tone (Namely, 2600Hz) that would cause a trunk to reset itself. Bill discovered that a recorder he had could play the same tone with the same effect. John Draper discovered through his friend, Joybubbles, that the free whistles given out in Captain Crunch cereal boxes made exactly a 2600 tone when blown, hence how he got his nickname, "Captain Crunch". This allowed control of phone systems that worked on SF, or Single Frequency controls. One could produce a long whistle to reset the line, then one could dial with groups of whistles (a short one for a "1", two short ones for a "2", etc.). This was the predecessor of MFing.

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