RCS is currently available for T-Mobile, Sprint and ATT consumers. We are working with other carriers to provide functionality on our devices.
One Ui Beta Team
Hello, I'd like to give more insights on this, not as an Samsung Care Ambassador but as an experienced customer...
While RCS IS available for T-Mobile, Sprint and AT&T, it isn't enabled/available for us on unlocked (U1) firmware. We have to resort to using hidden codes to enable it (which doesn't always work so well) and/or use third party apps to get this working, which is kinda unsatisfactory.
Furthermore, we need Samsung to step it up a bit and point us to the Jibe RCS servers. They already exist and are ready to use for these carriers (and others such as Verizon.) I have seen some carriers such as US Cellular or Sprint use Jibe while others lack true chat features.
It is exhausting and disappointing that such a simple feature that is ready to use with minimal efforts needed from Samsung's end hasn't been implemented for years! I've participated in many different betas for Samsung's flagships and have requested this each and every single time.
Please, it will only take the dev team a few minutes to get this in for us and as a result will make many users more than happy to natively have RCS/Chat features that actually work.