1. Check whether the phone has a film, if there is recommended to cancel the screen film and try.
2. If the phone's touch screen is completely out of order, it is recommended that you reboot the machine and observe again.
3. Try updating your phone's system version (Note: Please backup your device's data before upgrading).
4. If it is not effective, backup the data in the device (contacts, SMS, photos, etc.) and try to restore the factory settings.