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There’s a growing narrative that RCS Business Messaging—also known as RBM (Rich Business Messaging)—will replace SMS.
It won’t.
Not because the technology isn’t compelling—it is. RCS introduces richer content, verified branding, and more engaging customer experiences.
But in practice, RCS doesn’t operate as a standalone channel; RCS operates as a layer on top of SMS and MMS infrastructure.
And that distinction matters more than most teams realize.
The first constraint is simple and often overlooked: RCS is not universally supported.
Across devices, carriers, and regions, a significant portion of end users still cannot receive RCS messages. In many cases, that number exceeds 50%.
That means for any meaningful messaging program, a large percentage of your audience will never receive RCS messages at all. We don’t mean the message will be degraded or partially delivered; we mean not delivered.
So every time you send an RCS message, there are only two possibilities:
There is no third path.
Which means fallback isn’t a “nice to have.”
It’s required for basic message delivery.
This is where most of the industry seems to be getting it wrong.
There’s a common assumption that if RCS isn’t available, messages will automatically fall back to SMS, but that’s not how it works.
Today, most implementations follow one of two approaches:
Platforms use tools like Google’s RCS capability checker to determine whether a recipient’s device and carrier support RCS.
If RCS isn’t supported:
This isn’t automatic, it requires coordination across multiple systems.
Some platforms skip this step entirely.
In that case:
Delivery is simply lost.
In both cases, fallback is not built into RCS.
It has to be explicitly designed.
On a related note, another overlooked challenge with RCS is throughput.
RCS is inherently a high-throughput channel. In many cases, brands can be approved to send at significantly higher volumes than they are over legacy SMS channels.
But fallback doesn’t inherit those throughput levels.
When messages fall back to SMS or MMS, they are immediately constrained by:
This creates a mismatch:
You can send at scale on RCS—but you can’t fall back at scale unless your infrastructure is built for it.
And when that mismatch isn’t handled properly, fallback traffic becomes the primary point of failure.
Even when teams understand fallback conceptually, they underestimate what it actually requires.
Fallback depends on:
If those systems aren’t in place, fallback messages don’t just degrade—they fail.
And since fallback represents a large percentage of total traffic, those failures compound quickly.
There’s a tendency to position RCS as the next generation of messaging.
But structurally, that’s not what it is. At least not today.
RCS depends on SMS and MMS to function.
If your underlying messaging infrastructure isn’t strong, RCS doesn’t improve your system, it exposes its weaknesses.
We don’t treat RCS as a standalone channel.
We treat it as a real-time orchestration problem—where capability detection, message transformation, and throughput management all have to work together.
There are three areas where this becomes critical:
Most platforms require you to explicitly check whether a user supports RCS before sending.
We incorporate that capability detection directly into Telgorithm—so routing decisions happen automatically, without requiring a separate lookup or workflow.
RCS introduces high-volume send capability—but fallback traffic must still operate within legacy carrier limits.
Our patented Smart Queueing technology (U.S. Patent No. 12,457,522) is critical here.
We dynamically manage throughput:
So when fallback occurs, messages are automatically routed through the appropriate registered campaigns and numbers—without exceeding carrier limits.
This isn’t an optimization.
It’s required to prevent delivery failure at scale.
RCS message formats are not compatible with SMS or MMS.
In most platforms, that means you have to:
We eliminate that requirement.
Telgorithm uses AI to automatically convert RCS messages into legacy-compatible formats in real time—ensuring that fallback messages closely match the original experience without requiring manual duplication.
Taken together, this removes the need for:
And replaces it with a system that handles fallback dynamically, at scale.
It’s this: What happens when RCS isn’t supported—and how does your system handle it?
Because for a large portion of your audience, it won’t be supported.
If your platform doesn’t handle:
…then RCS won’t perform reliably—no matter how advanced the channel itself becomes.
RCS doesn’t replace SMS or MMS.
More than half of devices still don’t support it.
And even where it is supported, fallback is not automatic.
RCS only works when fallback is designed correctly.
That means:
Without those, RCS isn’t a new channel, it’s a delivery risk.
We’re introducing RCS Business Messaging through a limited beta, designed to help platforms build the right foundation from the start.
This isn’t just about turning on RCS—it’s about making sure it performs consistently at scale, working seamlessly alongside SMS and MMS.
If you’re evaluating RCS and want a clearer view of how fallback, routing, and throughput operate together in practice, we’d be glad to talk.
Join the waitlist for early access to Telgorithm’s RCS Business Messaging beta.
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