NYT pays tribute to Joybubbles.

The boy decided to talk back to the phone. Not to other people, not right away: to the phone line itself, and in its own language. At 7, with his perfectly pitched ear, he heard through the receiver the tone that controlled long-distance connections, 2,600 cycles per second. “I started whistling along with it,” he said, “and all of a sudden the circuit cut off, and I did it again, and it cut off again. And gradually . . . I figured out — back in the mid-’50s — just how to do it.”