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A red box is a phreaking device that generates tones to simulate inserting coins in pay phones, thus fooling the system into completing free calls. In the United States, a nickel is represented by one tone, a dime by two, and a quarter by a set of five. Any device capable of playing back recorded sounds can potentially be used as a red box.
Learn about the audible tones that indicate the status of a telephone call in different countries and regions. Find out the frequencies, cadences and exceptions of dial tone and other tones such as busy, ringing and zip tone.
Phreaking is a slang term for exploring and manipulating telecommunication systems, such as phone networks. Learn about the origins, techniques, and tools of phreaking, from whistles and blue boxes to pager cloning and DTMF tones.
A red box is a phreaking device that generates tones to simulate inserting coins in pay phones, thus fooling the system into completing free calls. In the United States, a nickel is represented by one tone, a dime by two, and a quarter by a set of five. Any device capable of playing back recorded sounds can potentially be used as a red box.
tones used by earlier inband telephone switching systems were simulated by a Red box or a blue box used by "phone phreaks" to illegally make or receive free trunk/toll calls. off-hook tone if the phone has been picked up but no number dialed for an extended period of time.
A blue box is an electronic device that produces tones to manipulate the North American telephone network. Learn about its history, technology, and how it was used by phone phreakers to make free calls.
Reorder tone is an audible call progress tone in the public switched telephone network that indicates the call cannot be processed. Learn about the tone characteristics, frequencies and cadences in different countries and regions.
John Draper, also known as Captain Crunch, is a computer programmer and former phone phreak who used a Cap'n Crunch whistle to make free calls. He worked for Apple, wrote EasyWriter, and was featured in Esquire and 2600: The Hacker Quarterly.
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