i barely recall a product that used a smart phone and app as the "backend" of a drone, the front end being a phone cradle and a vehicle [terrestrial; aerial; or

i barely recall a product that used a smart phone and app as the "backend" of a drone, the front end being a phone cradle and a vehicle [terrestrial; aerial; or aquatic flavours available] simply textto: yourdrone: or radio link for manual piloting.