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STU7777 said..
I predicted this was the next step in drones 12 months ago. Awesome! What Next???
Yep, the pixhawk flight controller from 3d robotics could do this 18 months ago with a Bluetooth receiver and an android phone. These guys made their stuff open source. It's why these developments can happen.
I have it set up on my hexacopter and it works well up to a distance of 10m.
all these guys have done is make a dedicated Bluetooth transmitter (probably can only be paired to the drone you buy, so don't loose it). And use a bigger antenna to slightly increase the range/reliability. As Bluetooth & wi-fi occupy the same frequency (2.4GHz) it is restricted to 2.5 milliwatts to restrict the range.
I'm using a 915mhz telemetry link that gives me up to 2km range (theoretical, confirmend 1km so far) with an android phone which is far more reliable. Bung it in a pelican case and you can do this follow me mode easily out to 100m. A 35m ceiling keeps it away from kite lines!
hexa's are great as if one prop fails, you can still land with a little control. Not go splat!