RCS: definition and how it works
Published and updated
RCS (Rich Communication Services) is the carrier messaging standard meant to succeed SMS, adding read receipts, typing indicators, high-resolution media, group chat and verified business senders, delivered over data.
How it works
RCS is a GSMA specification that carriers and phone makers adopted to give the default messaging app the features people know from chat apps: delivery and read receipts, typing indicators, full-size photos and video, group conversations and reactions. Unlike SMS it runs over the data connection, so it needs internet access and a phone and carrier that support it. When either end lacks RCS the message falls back to SMS or MMS.
The business flavour, RCS Business Messaging, is where it touches developers. Google's documentation describes it as letting brands engage customers with distinctive branding and rich media, measure engagement with read receipts and analytics, and build trust with a verified icon on the sender. Messages can carry rich cards, carousels and suggested replies that a recipient taps instead of typing.
Adoption is uneven. Android phones have supported RCS for years through Google's messaging client, and Apple added RCS support to iPhone in 2024, but business messaging requires the brand to be verified through an RCS provider and the recipient's carrier to have enabled the service. Coverage, pricing and available features vary by country and carrier, and in many markets RCS business traffic is still a small fraction of SMS.
For now, RCS is an enhancement layered on top of SMS reach, not a replacement for it. Transactional messages still need the SMS fallback to arrive everywhere.
- Google describes RCS Business Messaging as letting brands enhance the interaction with distinctive branding and rich media, measure engagement with read receipts and analytics, and build trust with a Verified icon. developers.google.com, checked on September 5, 2026
How this applies with textbee
textbee sends SMS from the phone's SIM and does not send RCS. Because RCS falls back to SMS, a plain text from your number reaches every recipient, whatever their phone supports, which is what OTP and notification flows need.
Related terms
- MMS: MMS (Multimedia Messaging Service) is the carrier messaging service for pictures, audio, video and long text, delivered over the mobile data connection rather than the signalling channel SMS uses.
- SMS gateway: An SMS gateway is the piece of software or hardware that takes a message from an application and hands it to a mobile network so it arrives as a text on a phone.
- Delivery receipt: A delivery receipt is the network's report that an SMS reached the recipient's handset, or failed to, surfaced by a gateway as a status on the message.
Sources
- RCS, developers.google.com, checked on September 5, 2026