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Rich Communication Services (RCS) protocol might soon be getting on to replace SMS. Google seems to be working on this protocol. SMS has been all over the world since 1992.
RCS is said to be an advanced version of SMS wherein it provides some advanced features like typing indicators, file transfer and many more.
The RCS protocol is not like the traditional SMS but however it works on mobile data or Wi-Fi. Google is all set to soon roll out its RCS support through the 'messages' app which is currently in its beta version.