SidePilot is an application created by Tom for iOS devices such as iPhones and iPads.
It uses a small Bluetooth repeater module which can be purchased from this store to collect data from your arducopter drone, and transmit it into a readable form to your iDevice.
Using the SidePilot application, you are able to connect to your drone, plan missions, change parameters etc. With updates being pushed regularly, the possibility are endless!
Please not that this is a single man operation, so replys may be slow depending on volume.