Sometimes it was possible to find a nearby local exchange which when the caller dialed the local code, then added 0, he would get free STD access.For those in the know, it was possible to modify the Post Office phone (preferably the 700 series) by fitting a suitable diode and push button.
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Phone phreaking got its start in the late 1950s in the United States. Phone phreaks spent a lot of time dialing around the telephone network to understand how the phone system worked, engaging in activities such as listening to the pattern of tones to figure out how calls were routed, reading obscure telephone company technical journals, learning how to impersonate operators and other telephone company personnel, digging through telephone company trash bins to find "secret" documents, sneaking into telephone company buildings at night and wiring up their own telephones, building electronic devices called blue boxes, black boxes, and red boxes to help them explore the network and make free phone calls, hanging out on early conference call circuits and "loop arounds" to communicate with one another and writing their own newsletters to spread information.
Before 1984, long-distance telephone calls were a premium item in the United States, with strict regulations.
The pulse counter in the exchange counts the pulses or clicks and interprets them in two possible ways.
Depending on continent and country, one click with a following interval can be either "one" or "zero" and subsequent clicks before the interval are additively counted.
By the 1980s, much of the system in the US and Western Europe had been converted.