What is an RCS-first strategy?

The mindset shift is from "we send SMS, maybe we'll try RCS" to "we send the best experience each device supports, RCS by default." As RCS-capable reach keeps growing (Juniper's forecast is ~3.8 billion users by the end of 2026), an RCS-first program automatically captures more of that richer engagement over time.

Design principle: write messages that shine as rich RCS yet remain clear and compliant as an SMS fallback, so no recipient is left with a broken experience.

Designing for both channels has one rule that makes it concrete: write the fallback first. Start from the plain text message that has to work on its own, with the URL spelled out and the instruction complete, then add the card, the media and the buttons as an upgrade on top of it. Teams that design the rich version first almost always produce a fallback that reads as a broken fragment, because the meaning had migrated into the buttons before anyone checked. Writing in the other order costs nothing and removes the failure mode entirely.

Operationally, RCS-first changes three things. Content becomes reusable templates rather than per-send copy, since the same card backs a transactional flow and a campaign. Someone has to own inbound replies, because RCS-first means two-way by default and a thread that looks conversational will be treated as one. And reporting has to be per-channel, since one send now produces RCS, SMS and MMS deliveries at three different rates, and a single blended number will hide both the cost and the performance story.

The metric to steer on is the delivered-as-RCS share, and the useful thing about it is that it is partly under your control rather than purely a property of the audience. It rises when handset and carrier support grows, which is slow and external. It also rises when you stop attaching features a segment cannot render, which is immediate and internal. So a falling RCS share between two campaigns is usually a message design signal, not an audience signal, and checking format before blaming the list saves a lot of wasted analysis.

One caution on the growth argument. Rising global reach is real but it is not evenly distributed, and a US programme should plan on US carrier and device support rather than on a worldwide projection. Measure your own list rather than inheriting a market number, because the share that matters is the one your actual customers produce.