For connecting iPhone to Arduino via Ethernet, WiFi or Bluetooth first of all you need to buy expensive interface hardware and secondly deal with complex libraries.
ArduCom was designed to connect your iPhone to Arduino via serial port with minimum hardware and software needs. With ArduCom you can make your own simple interface and use serial ports available in Ardunio to communicate with iPhone.
ArduCom-lite can be downloaded through AppStore. Instruction for how to build your interface and how to implement in your Arduino program can be found in this webpage.
See demonstration of ArduCom in our youtube channel : https://youtu.be/ROMvwrd0Au8