Well, not much really. But The iPhone’s Full Circle of Irony is interesting nonetheless for anyone interested in a very brief history of phreaking:

"In
1957, Engressia, a child genius who was blind since birth and
fascinated with listening to telephone recordings, realized that if he
whistled into the phone at a certain pitch, the recordings would stop.
As it turned out, Engressia had perfect pitch and could whistle at
exactly 2600 Hz?the precise frequency used by the phone company to take control of a trunk line…"