I already have whatsapp installed, which keeps me connected. Plus delta chat is really helpful.
I don't know what xmpp is or how it works.
The best place to start is https://joinjabber.org/ (Jabber is another name for XMPP).
The apps for Android are free on F-Droid.
AFAIK. All major clients for XMPP is open source and gratis.
Two good options for Android is Conversations and Snikket. Both are available on F-Droid and Google Play Store. Conversations on GPS is a donationware version though.
On iOS you have Snikket and Monal.
On the desktop you have Gajim. I think it's available for Linux, Windows and Mac OS.
You also need an account. Conversations offers accounts for free over at https://account.conversations.im/. There's probably a lot more services as well.
Install monocles. Its easy to set up a new account and start using it right away. You can find it on f-droid but I think it's on play store too.
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