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By re-creating these tones, phreaks could switch calls from the phone handset, allowing free calls to be made around the world.

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Phreaking has since become closely linked with computer hacking.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.Such key-locked telephones, if wired to a modern DTMF capable exchange, can also be exploited by a tone dialer that generates the DTMF tones used by modern keypad units.These signals are now very uniformly standardized worldwide, and along with rotary dialing, they are almost all that is left of in-band signaling.Some typical tricks used between the 1950s and 1970s included: 9-1-11.

By dialing an exchange local to the caller's phone (preferably a call box phone), dialing 9-1-10 then at the right moment tapping the phone rest to add an extra pulse, this could give irregular STD (Subscriber Trunk Dialing) access.

The exchanges worked on pulses received from each subscriber's phone, so tone signaling was of no use.

The techniques primarily relied on the quirks of the exchange wiring, or facilities put in by the engineering staff.

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.

Phreaking is a slang term coined to describe the activity of a culture of people who study, experiment with, or explore telecommunication systems, such as equipment and systems connected to public telephone networks.