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Bye bye free phone calls

Amr M. Kamel's blog - Wed, 22/08/2007 - 4:20pm
Joybubbles, the man who exploited the vulnerability of making free phone calls by just whistling has died yesterday, he was 58 years old..

Joe Engressia, who legally changed his name to Joybubbles in 1991, played a pivotal role in the 1970s subculture of "phone phreaks" after discovering at a young age that he could make free phone calls by whistling tones (source)