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Is it still possible to do phone phreaking? Yes, with Android on LTE
In the 1960s and 70s, technically savvy enthusiasts sought to game telecommunications systems to make free calls, keeping telecom engineers on their toes.
That practice, known as phreaking, involved such luminaries as Steve Jobs, Steve Wozniak and John Draper, known as Cap'n Crunch, who used a whistle from a cereal box to meddle with AT&T's long-distance trunk lines.