In the Go 4 app, when I enter Academy/Simulator, the simulator opens and shortly therafter the screen goes blank and the app restarts.  The latest version of the Go 4.0 app is running on a ZTE phone with Android 7.1.1.  My Mavic Air and Controller have the latest firmware as of 6-19-2018.  I am near an airport, but have flown the drone at very low altitudes and short distances.  Does anyone have a suggestion.

Hi there thanks for reaching DJI Forum, we do apologize if you are having problems with the Academy/Simulator on your app, sad to say the mobile phone that you are currently using which is the ZTE phone is not supported to run the DJI Go 4 app. Below is the list of full compatible phones.

DJI Gamora Posted at 2018-6-19 10:00
Hi there thanks for reaching DJI Forum, we do apologize if you are having problems with the Academy/Simulator on your app, sad to say the mobile phone that you are currently using which is the ZTE phone is not supported to run the DJI Go 4 app. Below is the list of full compatible phones.

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Thanks Gamora.  I will try the simulator on my iPad.