Complicated because vendor had told me to keep the drone then changed his mind and wanted it back .This threw ebay software into a doom loop and I could not print a returns postage label .Had to get ebay to intervene and was then able to print label and return drone.Got my money back so all is fine but took 3 weeks to sort out .Incidently have since found out that these drones (HS720) will work stand alone ,they dont need a mobile phone to work