What is "joybubbles"

Joybubbles ( – ), born Josef Carl Engressia, Jr. in Richmond, Virginia, USA, was an early phone phreak. Born blind, he became interested in telephones at age four. He had absolute pitch, and was able to whistle 2600 hertz into a telephone (see Blue box). Joybubbles said that he had an IQ of “172 or something". Joybubbles died at his Minneapolis home on . According to his death certificate, he died of "natural causes" with "congestive heart failure" as a contributing condition.