When I open my DJIGo app on my iPhone 6s+ it goes right to the flight screen. My Phantom 3 Std is on and the controller is on and connected to my phone but when I select the app it brings up the main flight screen. Is there an intermediate screen to select sim mode that I am missing? I have DJIGo 2.5.1 and just updated my firmware for the bird. Help appreciated. Thanks.