• A communication protocol between mobile telephone carriers as well as between phones and carriers, 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. RCS is part of the broader IP Multimedia Subsystem, and is also marketed as “Advanced Messaging,” “chat features,” “joyn,” “SMSoIP,” “Message+,” and “SMS+.” The first RCS specification was released in 2008. ← Wikipedia

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