phreaking
/ˈfrikɪŋ/
noun
- The activity of exploring or exploiting telephone systems, often to make free calls or understand how they work.
- Phreaking became popular in the 1970s when people discovered they could use toy whistles to mimic phone tones.
- The movie shows a group of teenagers getting into phreaking as a way to call anywhere in the world for free.
- Modern phreaking is rare because most phone systems are now digital and harder to trick.