Could not run build/ios/iphoneos/Runner.app on Try launching Xcode and selecting "Product > Run" to fix the problem

Question

When running an iOS App on a real iPhone (not Simulator) you may run into this problem.
The reason is because the app isn't signed by a trusted source.

Answer 1

To fix this you have to Open Settings on your iPhone and navigate to: General -> Device Management, then select your Developer App certificate and "trust" it.