Then there is the theme of "My Mate and I". One theme is a collection of various Mate prefabricated theme wallpapers and the ID on the back of the mobile phone. Click the switch button at the top of the lock screen to open the "memory killing" mode: slide the screen to the right, select the model of Mate mobile phones in past dynasties, and the lock screen will immediately display the front of the mobile phone and prefabricated wallpaper, such as "Wings of the Future" of Mate40, "Earth Painting" of Mate30 and "Official Neverland" of Mate20. I chose Mate30. Besides its wallpaper, I also like its "super eye" design. Slide the screen to the left to select the ID on the back of the phone, and double-click to switch the color on the back of the phone.