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Google Messages Alternative
(lemm.ee)
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
[Matrix/Element]Dead
much thanks to @gary_host_laptop for the logo design :)
It depends on what exactly you're looking for in a messenger. If you are able to get people onto a specific platform, go with something like Signal, that's your best case scenario.
If you're unable to do that though, and need SMS/MMS, you have options. QUIK is an app I highly recommend for SMS and MMS. The big downside, however, is that RCS is seemingly exclusive to Google Messenger on Android. If you want to use RCS, you're kind of stuck unfortunately.
To minimize needing to use it, you could buy an old iPhone, jailbreak it, and try and set up Beeper Mini on an android device. That's what I do at least, which helps quite a bit. It's finicky and just not perfect, but it's better than just using SMS/MMS.
Hopefully this comment covers your use case and you're able to get some useful info out of it.
I don't think any of the recommendations here are even close to what OP is asking for... QUIK from my understanding is just a replacement SMS app, it does not "sync messages to other devices" or allow you to send SMS messages via your phone from other devices, nor does it have a desktop/web version, all of which is what Message+ does. Pretty sure this requires a self-hosted server to do (or a third-party proprietary service like MightyText).
SmsMatrix, KDEConnect/GSConnect, Nextcloud Talk are some examples that will do this.