Thanks for that info and choosing the Apple Support Communities. Based on what you stated, it seems you are experiencing issues with your iPhone X not showing incoming phone calls on the display. To help with this issue, please make sure your iPhone is up to date to iOS 11.3, as the updates contain stability fixes that can resolve issues like yours, as well as important security updates to keep your iPhone safe.
This thread has been closed by the system or the community team.
You may vote for any posts you find helpful, or search the Community for additional answers.
Iphone x incoming call delay
Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.