A look at an original iPhone prototype

Apple developed this particular board, an engineering validation test (EVT) sample, for engineers working primarily on the software and radio portions of the original iPhone. Apple used this so that engineers could plug a regular landline phone headset into this iPhone development board and test voice calls. Apple engineers could test every part of the original iPhone with this board

On this particular development board, there’s even a screen, but the iPhone’s home button (known here as the menu button) is mounted on the board to the left of the display, and the power and volume buttons are on the left-hand side of the board.

Source: www.theverge.com