Despite the risks, he taught himself phreaking to learn how telephone systems were structured and sometimes to make free calls.

He admitted to phreaking the campus phone system to bypass long-distance charges.

The retired phreak reminisced about the early days when a few enthusiasts could route long-distance calls with little more than a tone generator.

In the 1970s he used to phreak long-distance lines to make free calls.

They phreaked the old payphone to make free long-distance calls.

Phreaks tinkered with payphones late into the night to map the telephone network.

She phreaks the campus phone system to make long-distance calls for free.

The security team discovered evidence of Van Eck phreaking after analyzing the electromagnetic emissions from the office monitors.