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Yes, really, themes for phones are long gone in my opinion, especially for those who use smartphones from Apple. There simply is a light and dark theme that appeared in iOS 13. In general, I think the main thing is that the phone has a good screen saver. Personally, I always find great options for phone wallpapers here - https://akspic.com/album/720x1280 [akspic.com]
If necessary, use it, I'm sure you will find cool wallpapers for yourself.