Rich Communication Services enables our phone messages to do things like share high-res photos and files, chat with a group, know when messages are read, or video call, etc.

Not every major smartphone advance is hardware-based or flashy, and RCS is a solid example of that. RCS messaging is anything but. A massive upgrade to the outdated SMS-powered text messaging we’ve been enjoying since the 1990s, RCS messaging turns your text messages into a high-powered chat app, complete with read receipts, real-time reply indicators, and interactive media.

Advantages

• End-to-end encryption (Fully secured in comparison to SMS, MMS)
• Send/receive text, photos, files, gif, contacts, etc.
• No media compression
• Realtime typing indicator
• Realtime delivery report
• Group Chat
• Video call

Steps to enable

• Download Google Messages App
• Open the Messages app
• Click three dot menu on top right corner
• Tap Settings
• Tap General
• Tap Chat features
• If “Enable chat features” toggle is off, tap once to turn RCS on
• If “Enable chat features” toggle is on, it means RCS is enabled (Modify related settings as per need)

PS: Both sender and receiver need to enable Chat features to get it work

Learn more at Official Website: Why RCS? (google.com)

Learn more about RCS at Wikipedia: Rich Communication Services - Wikipedia