Custom UI for iOS and android

How does mobile terminal communicate? Is there a simple native Demo? It’s too much hassle to customize the UI on the react-native. Thank you for your help.

For the jitsi, I am a beginner and want to build my own App quickly. Is there any good demo? Thank you very much!

Many thanks for your reply, but I still don’t know how to customize UI. Is there any good solution?

Checkout jitsi-meet source code, modify and follow mobile build documentation for the OS you want.