Does the DJI drone need to be on the DJI app to fly manually? I tried to start it up inside the house with propellors off to see if it can work without the iPhone app. It didn't really work, but once I put the phone it worked. I know there are some metal switches on the top corners, do any of those help switch to manual or app mode? Also do you have to use a phone or Tablet w/ cellular service for the app to work since it uses a map to guide itself home. Does the drone load the map to the phone or the map from the phone? I was considering to get an iPod Touch and wondering if it can work without 4G network. Just because the app uses a ton of battery, would rather not have to use my phone if I don't have to. So that way I can leave my phone in my pocket and conserve its battery so I can still get calls during the day. Plus what if I get a call and it blocks my screen midflight or may be in the middle of "coming back home".