There are multiple good XMPP mobile apps for Android: https://joinjabber.org/docs/apps/
The story on iOS is somewhat less good right now, but Monal is ok and Movim works quite well as a PWA in Safari.
There are multiple good XMPP mobile apps for Android: https://joinjabber.org/docs/apps/
The story on iOS is somewhat less good right now, but Monal is ok and Movim works quite well as a PWA in Safari.