What is RCS protocol?
Rich Communication Services (RCS) is a new messaging protocol, intended as a replacement to good old SMS and MMS on Android.
Rich Communications Service is a system that allows you to send rich and engaging messages to consumers within their native SMS inbox on compatible Android mobiles. Shortly RCS gives user an app like experience, user will receive Rich media and guided responses directly into the native SMS inbox.
RCS act likes an app, you can send expressive images, videos, audio and call to action buttons.