Starting with iOS 13.1 and iPhone 11 models (the 11, Pro, and Pro Max), your phone will report if it has a third-party screen: “Unable to verify this iPhone has a genuine Apple display.” It starts as a persistent message on your lock screen, lasting for four days. After that, the warning lodges itself in the Settings for 15 days, and then in Settings > General > About after that. It’s also added to your “device information,” so that Apple staff can see it.
This warning, similar to the recent addition of battery warnings, happens even if you swap a genuine Apple screen from one phone to another. To avoid the warning, you have to have a genuine Apple display installed by Apple themselves.
The TrueTone functionality will stay on the iPhone as we use a special programmer to transfer the data across.