A very cool person has developed a FOSS mobile app! This works both on Android and iOS.
It is not quite as feature complete as the other stable horde web clients like Artbot and Stable UI (which also work on phones perfectly well), but I’m sure it will get there very soon!
You can get it on Google Play Store and Apple App Store
How do I Mark requests NDFW
you’ll need to contact the developer of that app. It should have some sort of toggle