1. Check whether there is a film on the phone. If you have any suggestions, cancel the film on the screen and try again.

2. It is recommended that you restart the machine and observe it again.

3. Try to update the mobile phone system version.

4. If it is invalid, back up the data in the device (contacts, text messages, photos, etc. ) and try to restore the factory settings.

If the problem still exists after the above operation, it is recommended that you take the machine, purchase invoice and warranty card to the local after-sales service center for testing.