No matter how I change the theme of my Xiaomi 3 SMS, the contact interface is the default, but the SMS dialog box can be changed.

1. The theme application may fail due to an error in the application. You can go to Settings-Applications-All Applications-Theme Style, clear the data, restart the phone after clearing it, and then try to apply the theme.

2. Or it is caused by the incompatibility between the third-party theme and the system. You can enter the theme style and change the system theme back to the default theme to solve the problem.

3. It may also be caused by system problems. You can restart the phone to solve it. If necessary, the mobile phone system can be restored to the factory settings or upgraded to the latest version.