Short answerRCS — Rich Communication Services — is the successor to SMS built into the default messaging app on most Android phones and, since 2024, on iPhone. It carries images, buttons, carousels, verified sender branding and read receipts. SMS carries 160 characters of plain text and reaches everything.
| SMS | RCS | |
|---|---|---|
| Reach | Universal — every phone, every network | Growing, but depends on handset, OS version and operator support |
| Needs internet | No | Yes |
| Content | 160 characters, text only | Images, carousels, buttons, suggested replies |
| Sender identity | A sender ID string | Verified brand name, logo and colour |
| Read receipts | Delivery only | Delivered and read |
| Fallback | None needed | Falls back to SMS where RCS is unavailable |
Not as a replacement. RCS is worth adding as a first attempt for marketing and rich service messages, where the branding and interactivity genuinely change response rates.
It is not yet a substitute for SMS on anything critical. Coverage still depends on the recipient's handset, their OS version and their operator, so every RCS programme needs an SMS fallback behind it — which is the same pattern as any other rich channel.
They compete for the same job. RCS has the advantage of living in the phone's default messaging app, so there is nothing for the customer to install. WhatsApp has the advantage of an installed base that is already enormous and consistent across platforms.
In practice the right first channel is market-specific: WhatsApp dominates in much of Latin America, South Asia and the Middle East, while RCS reach follows Android and operator support.
Ritorica delivers SMS, WhatsApp, Viber and Telegram with automatic fallback between them.
Request a demo