@183231bcb
For every non beta tester there is element or fluffychat or schildi available on fdroid, Google play store or Apple store.

They are stable and chat, call and videocall and even jitsu conference works.
A favor of matrix and xmpp over other systems is you can install a desktop app in parallel and use them async. No need to scan a qr code for that and keep the mobile on for.