Samsung Galaxy users are facing RCS issues in Google Messages after transferring data to new devices using Samsung's Smart Switch, following Samsung's shift to Google Messages as the sole RCS-supporting app in the U.S. Users report that RCS functionality stops post-transfer, with error code 3100 appearing when trying to enable RCS or send messages. A Google representative suggested that corrupted cache files from the transfer may be the cause. Some users are considering factory resets, but it's unclear if this will resolve the issue. Similar RCS problems have also been reported by users switching carriers, potentially due to incomplete number-porting processes. Google is aware of these challenges but has not provided a universal solution.