The True Tone
The True Tone display is one of the most important feature of the latest iPhone's. It is completely invisible at first time usage, and you can feel the difference only by picking up a device without True Tone. As Apple Vice President of Marketing Phil Schiller noted, as soon as you try this feature, you will no longer want to return to the device without it.
If you crack your screen on the latest iPhone's on the each Genuine screen has encrypted code. During the screen replacement make sure you copy the True Tone Code from the Original screen.