Dension Allows You to Operate Any RC Toy From Your iPhone

Dension's new WiRC controller, integrates with any RC vehicle and creates a wi-fi hotspot that allows your iPhone to connect and control up to eight different servos.
There is also a set of USB ports, so the WiRC controller can also connect to an included compact webcam, broadcasting a live video and audio feed that can be monitored on your phone.
At $179 it certainly isn't a cheap upgrade, though, high-end RC enthusiasts are certainly used to spending lots of money on their hobby.

Source: http://www.wirc.dension.com/