Door: Steve Wozniak.

“The revolutionary device was used with a keypad tethered to an ear piece. It fooled a phone company’s switchboard by reproducing its specific tones. As a result, the user was able to get overseas phone calls without paying. … A humble-looking device that is credited with starting the digital revolution has emerged 45 years later to reveal Apple’s fraudulent beginnings. The ground-breaking digital blue box was developed by Apple’s co-founder Steve Wozniak in 1972 and was the inventor’s first printed circuit board. But the box was actually a hacking device that fooled a phone company’s switchboard by reproducing its specific tones.”

Aldus Tim Collins For Mailonline