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Phone Phreaking was all the rage.
We used to use Applecat modems, they could naturally generate a lot of "control frequency tones".
It used to be, that the "sound"(Actually an electronic pulse converted for the phoneline) of a quarter dropping in to a payhone credited the next call with $.25. You could essentially continue to drop fake quarters on to a phone line, and proceed to use them up on a call.
You could ask generate tones that would knock an operator off the line. You'd esentially call in to a switchboard and get an operator. Your modem would generate a specific tone, and the operator would lose the line and you could then use it.
There's much more to it, but that's what I remember.
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