There are a lot of mobile clients for Lemmy. The web interface is not that great in my opinion, so a mobile app is kind of needed. Some of the more popular ones:
- Boost for Lemmy (Android, beta version)
- Liftoff (Android and IOS)
- Voyager (web application but has IOS app in Testflight)
- Jerboa (Android)
- Connect (Android)
- Thunder (Android and IOS)
- Mlem (IOS)
- Memmy (IOS)