Is the ratio of cell phone wallpaper 9:16

The ratio of cell phone wallpaper is not necessarily 9 to 16.The common ratio of cell phone wallpaper is 1280 by 720, 1920 by 1080, and 2560 by 1440.
But with the emergence of full-screen cell phones, the ratio of cell phone wallpaper has also changed.
For example, Huawei's wallpaper for the Huawei P40 has a ratio of 2340 by 1080. IPHONE12's cell phone wallpaper ratio is 2532 by 1170.

Overview of cell phone wallpaper and characteristics

Huawei cell phone vertical screen wallpaper is generally 9 to 16. the vast majority of cell phone vertical screen of the full screen is 9 to 16. however, in different sizes and resolutions of cell phone screen, the middle of the display window of the hand vertical screen ratio is not the same. The higher the pixel count of the phone screen, the smaller the proportion of the screen occupied by the title bar and the purchase bar, and the larger the space left for the display window.