RCS features just completely stopped working for me one day. I can see people are typing or if they saw my message, but that's it. I cannot reply to a specific message anymore, and a couple other things are broken too. I've signed in and out, cleared the app cache, and even did a hardware reset. Nope! I just doesn't work anymore. It also won't let me receive messages from a specific group chat. I can message the people individually, I can participate in other group chats, but a group chat with those two people refuses to work. It's far from a perfected program.