I updated to iOS 13 on my iPhone X and have Xcode 10.3 and am unable to run my project ton my phone. It gives me a notice of:
Could not locate device
I downloaded the Developer disk image for iOS 13.0 from here and added support file in Xcode Version 10.3 (10G8).
https://github.com/iGhibli/iOS-DeviceSupport/blob/master/DeviceSupport/13.0.zip
All other devices support list.
https://github.com/iGhibli/iOS-DeviceSupport/tree/master/DeviceSupport
Follow These steps.
Unzip downloaded file. Right click on Xcode and click on Show Package Content. Then paste your file on path.
Applications -> Xcode.app -> Contents -> Developer -> Platforms -> iPhoneOS.platforms -> DeviceSupport Then at last restart your Xcode.
It works for me.