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What is a telephone Phreaker?

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. ... Phreak, phreaker, or phone phreak are names used for and by individuals who participate in phreaking. source

My addition:
So i can tell you now it was all started to call for free...