Technically, the messaging app performs a capability check to see whether the recipient can receive RCS. If yes, the content is sent over IP through an RCS backend (Google’s Jibe platform powers most of the world, alongside carrier deployments). If no, it downgrades gracefully to SMS/MMS.
For business messaging, the path adds a step: a brand’s message goes from the business (or its platform, like SimplyRCS) to the RCS backend as a verified RCS agent, then to the customer’s inbox, with the same SMS/MMS fallback guaranteeing delivery.
Key facts
- Transport: IP-based, not the cellular voice/SMS channel, which is why RCS needs a data connection.
- Backbone: Google’s Jibe platform operates RCS for most carriers and for Google Messages; Apple Messages connects via supporting carriers.
- Fallback: SMS/MMS is the universal safety net and the reason RCS never costs you reach.