https://wccftech.com/apple-display-warning-iphone-11-non-genuine-parts/

Smartphone displays can be costly to repair, especially when undertaking an authorized route. This is one reason why users often don’t mind getting them fixed from unauthorized service providers who do it for less money. However, Apple certainly doesn’t think it’s a good idea. A new press release says that an Apple display warning will now be shown if a non-genuine screen is detected on the iPhone 11, iPhone 11 Pro, or the iPhone 11 Pro Max.

If you have somehow already managed to smash the screen of your new iPhone, Apple wants you to get it replaced at its outlet, Authorized Service Provider or Repair Center. Otherwise, be prepared to receive an Apple display warning stating that ‘yours isn’t genuine’, plastered on the Lock Screen for the first four days after you get the screen replaced and in the Setting apps for fifteen days. After that, this information will be displayed in the About section of the General Settings.