Phone Tones: The hidden language of phone number beeps
Twenty Thousand Hertz
The Key to Hacking the Phone System
The key to hacking the phone system was reproducing a tone of 2,600 Hz. The freaks could trick a remote switching machine into thinking the call had been disconnected. From there, they could make long distance calls and disguise themselves as toll-free numbers or directory assistance. Unfortunately, technological advancements didn't translate to higher quality calls.
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