I'm in the same boat. Unlocked S20 on AT&T. Apparently if you have the AT&T version you get advanced messaging but if you are unlocked you get punished. I did just see an article posted about 2 weeks ago that says no matter what carrier you're on we should be getting RCS on unlocked S20s. Google teamed up with Samsung to make this happen so you won't have to use Google messages. It will work in Samsung messages. I personally don't want to use Google messages. I don't like it as much. You can't pin messages to the top and also I like how Samsung messages are better for one hand use. Hopefully they get moving on this soon because SMS/MMS is awful especially with how big photos are now with all these better cameras. It's a real bummer this isn't already universal for all carriers and all Android users.
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