Does anyone know of an open-source alternative to Google's "Messages" app, which takes care of SMS/text messages on my phone?
I was looking for open-source alternatives on PlayStore and F-Droid but can't really find anything – most apps seem to target some extra purpose than simply handling SMSs.
(Edit: I'd like to stay away from the "Simple Mobile Tools" line because I don't know if it's open source, and I don't like the way they promoted some apps – forcing users to update to pro and similar.)
I honestly don't like RCS, because when I send an SMS, I want it to be using that old protocol that doesn't depend on network functionality. Whereas any real chatting I usually take using more secure apps. SMS for me is "hey, you're not responding on our normal chat programs, is your wifi dead or you roaming?" kind of situation.
Agree about the security. I don't use SMS regularly, but some people message me with that in emergency situations, for instance if they don't have wifi or data. It's also still used to get temporary authentication codes.