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Rich Communication Services (RCS) is a communication protocol between mobile telephone carriers and between phone and carrier, aiming at replacing SMS messages with a text-message system that is richer, provides phonebook polling (for service discovery), and can transmit in-call multimedia. It is part of the broader IP Multimedia Subsystem. Google has added support for end-to-end encryption for all chats in their own RCS-based app, Messages.It is also marketed as Advanced Messaging, chat features, joyn, SMSoIP, Message+, and SMS+.In early 2020, it was estimated that RCS was available from 88 operators in 59 countries with approximately 390 million users per month.
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