camera view doesn't show up properly on iphone screen
most of the screen is green, just got mavic today and haven't a clue

Could you please clarify your iPhone model?
Please make sure you have enabled hardware decoding from DJI GO app and do not have any programs running in the background.

Could you take a screen shot of the problem and some more detail so we can help you. should be easy enough to do this when the issue is happening (hit the home and power buttons at the same time)

Thanks
Rich