Why does my iPhone screen dim when I'm flying the DJI Mini 2? Here's a method to help keep your phone cool while flying. DJI has updated the DJI Fly App repeatedly in the last few months and one feature they removed for iOS users is the option to turn OFF the phone charge feature. Now, the iPhone will constantly charge while connected to the DJI Fly App and this creates a real heat issue. The iPhone is already extremely busy during a flight and the constant charging seems to create an unreal amount of heat. iPhone has a built in safety feature so when the phone gets too hot, the screen will dim and may even go black. This creates a huge safety issue when flying a drone and we've experienced this numerous times during flights in the recent weeks. We think there's a way to help keep your iPhone cooler during a flight and that's what this video is about.