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| phreaking | |
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Knowing this, certain people developed a way to use a Whistle or other device (i.e. a Blue Box ) to generate a 2600-hertz Tone on a line that was already in use, making it possible to call anywhere in the world on the line without anyone being charged. Once the Operator mode was established using these techniques, it would then become a simple matter of presenting valid DTMF Audio signals to dial the desired actual phone number. Cracking the phone system became a hobby for some in the mostly under-20 set who came to be known as Phone Phreakers . At one point in the '' got its name from the frequency itself. Today, long-distance companies use Signalling System 7 , which puts all channel signals on a separate signaling Channel , making it more difficult to break into the phone system. |