We're going to be standardizing on built-in Bluetooth for all 3DR vehicles and autopilots in the future, but you don't have to wait for that -- you can use Bluetooth right now with this nifty Bluetooth add-on kit ($24.99). It's pre-set for 3DR gear and sends MAVlink at 57k to any mobile device or laptop running DroidPlanner, AndroPilot, Mission Planner or APM Planner. I posted a DIY tutorial on how to roll your own BT link a while ago, but for those who don't want the hassle of making cables and configuring radios, we've now done it all for you.
Leave your telemetry radio and OTG cable at home, and make a direct Bluetooth connection to your phone, tablet or laptop for pre-flight mission planning and vehicle setup. It has a range of 30m, which is fine for setup, mission planning and even close FollowMe mode -- all without bulky long-range radios.
Just plug it into your telemetry port and pair with your device. It's the easiest way to make a telemetry link -- no extra gear required!