The cracking or exploring of a telephone system, e.g. trying to get free calls or to discover special service numbers or other internal technical information.

present participle of phreak

(slang, dated) A person who engages in phone phreaking.

(slang, transitive, intransitive, dated) To engage in phone phreaking.

plural of phreak

Third-person singular simple present indicative form of phreak

simple past tense and past participle of phreak

The process of eavesdropping on the contents of a CRT or LCD display by detecting its electromagnetic emissions.