Everything worth knowing, nothing that isn't.
Where rich cards run
RCS Business Messaging and WhatsApp both support rich cards and carousels; SMS does not, so cards are delivered on those channels with SMS as the text fallback. See /answers/what-is-rcs-business-messaging and /answers/rcs-vs-whatsapp.
Why they work
A card with an image and a clear action converts better than a text line, because the next step is one tap away inside the thread — useful for commerce, order updates, and bookings. See /answers/what-is-conversational-commerce.
Design with fallback
Because not every device receives RCS or WhatsApp, design the campaign so recipients without them still get a usable SMS. See /answers/sms-fallback-strategy and /products/omnichannel.