A few app recommendations:
Android: kandruIM ( free ), Xabber ( free ), “Conversations” (donation if from Google Play Store, or free from F-Droid Open Source App Store), ...
Software and information:
For our XMPP servers we use the software Prosody IM.
Prosody is a modern XMPP communication server, with good configuration options and a high system resource efficiency. Additional functions can be enabled and disabled easily.
We offer XMPP servers in 40 countries You can choose where you want to host your XMPP chat server.
The XMPP server is pre-installed and ready-to-use at delivery. You are able to add new users right away, and use chats, file transfer, ... directly on all platforms.
Install app on your device, log in and you are ready to start. No technical adjustment or setup necessary.
You receive detailled information in the setup email, how to create/delete/edit/... users. All you need is an SSH program, e.g. Putty for Windows or simply the command line for Linux.
The resources / hardware on the VPS are cloud-based, which means if you should consume 90% of the resources on the VPS (many chats, transfers, ...) the resouces increase automaticly to a higher level and you will not get out of resources.
On the server itself all updates are carried out automatically, or we will support you at individual requests and adjustments if necessary.
It is not allowed to install other software than the ones we have set up for XMPP! Changes to the XMPP and its service are, of course, allowed. If our monitoring reports a utilization / execution of a program that has not been installed by us, OwnCube is entitled to block the server immediately.