Blue Box
Digital Blue Box
Last updated
Digital Blue Box
Last updated
"A blue box is an that produces tones used to generate the tones formerly used within the North American long-distance telephone network to send line status and called number information over voice circuits. This allowed the user, referred to as a , to surreptitiously place long-distance calls that would be billed to another number or dismissed entirely as an incomplete call. A number of similar "color boxes" were also created to control other aspects of the phone network." - Wikipedia
