Strange, my review seems to have been deleted right after getting a response notification. Reposting and dropped a star for that: RCS is incredibly unstable. Messages often take extended periods of time to send or don't send at all, senders see me connected but their messages aren't delivered, the app needs to be forced closed to send - usually indicated by Chat settings indicating "Connecting." Gotta say I see why Apple doesn't want to work with this protocol.