Mobile messaging revenue worldwide by carrier standard from 2015 to 2021 (in billion U.S.D)

NOTE:

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 transmit in-call multimedia.

https://en.wikipedia.org/wiki/Rich_Communication_Services

&

SMS (short message service) is a text messaging service component of most telephone, internet, and mobile-device systems.[1] It uses standardized communication protocols to enable mobile devices to exchange short text messages. An intermediary service can facilitate a text-to-voice conversion to be sent to landlines.
SMS was the most widely used data application, with an estimated 3.5 billion active users, or about 80% of all mobile subscribers, at the end of 2010.

https://en.wikipedia.org/wiki/SMS

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