Apple iPhone 4 pinouts
The connector/pinout information may be applied to the Apple model iPhone 4
Apple iPhone (1G, 3G, 3GS, 4, 4S) Dock cable connector pinout Used in iPhone (1G, 3G and 3GS) mobile phones for charging, connecting to a PC via USB or Firewire, to a stereo via line-out, to a serial device (controlled via the Apple Accessory Protocol).