How to fix iMessage that is not working on your iPhone X after an iOS update

To restore the original or default configurations, you may need to reset all of your device's settings. This is frequently required to rule out any system faults that may have been caused by recent firmware updates. Unlike a factory reset, this reset will not erase any data or personal information stored on the iPhone's internal storage, therefore no data will be lost. Here's how you do it:

1. Navigate to the Settings-> General-> Reset option from the Home screen.
2. From the drop-down menu, select Reset All Settings.
3. Enter the right passcode for your device if required.
4. Then, on your iPhone X, press the option to complete the settings reset.