Is it feasible to design and construct Smartphones apps which can access , monitor & control quadcopter drone wireless device working at 2.4 GHz & 5.8 GHz frequencies?

Thanks & Regards,
Prashant S Akerkar

 

You'll have to be much more detailed in your description. Those apps definitely exist for certain commercial drones (the DJI ones, for example). Are you talking about controlling any random drone that happens to fly by, or some specific model you have? In general, your phone will have to interface with hardware that is on board the drone already.