Google tells us that it's reached out to carriers to work on fixing the current RCS glitch impacting the Messages app.
Google Messages RCS issues: two documented failure patterns, and the one official fix Google Messages RCS issues tend to show up in one of ...
The Google Messages 3100 error is blocking RCS for many users, especially Galaxy switchers. Here's what causes it and how to ...
Open Google Messages → profile icon → Messages settings → RCS chats → turn off “RCS chats.” Wait a full 5 minutes (not 30 seconds — the deregistration needs time to propagate to Google’s servers).
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