SMS+Messages or SMS+Hangouts, Facebook Messenger, WhatsApp, Kik, WeChat, Viber, LINE, BBM, Telegram, Signal, Sicher, and I&#x27;m sure I&#x27;m missing some. Used to just install a multi-protocol chat client and be done with it, but now everything&#x27;s a fancy service with special clients to sync state across devices and whatever else they do.