Here is a handy tool that lets you link your ArduiPilot-based drone to your smartphone or tablet. Bluetooth Bridge lets you use your smart handheld devices as a ground station for your drone. It is compatible with 3DR (433 and 915MHz) and RFD90 radios.
The device has a range of 1km and works with DroidPlanner & Andropilot. You can find out more on Kickstarter.