No single channel is the right answer for every message your team sends.
Teams often pick one anyway. They wire SMS or RCS into their systems and route everything through it. That caps what each message can do, or it leaves reach on the table for the phones the channel cannot serve. The comparison worth making, SMS vs RCS, comes down to matching each message to the channel that carries it best.
The teams getting the most from business messaging route by message type. One-time codes and universal alerts go one way. Branded, interactive messages go another. That call gets easier once you know how SMS, MMS, and RCS each behave across devices, so it rests on how the channels work rather than on habit.
Knowing what RCS for business is and where it fits in a messaging strategy makes the rest straightforward. By the end, you will be able to look at any message your team sends, name the channel that fits, and run both without managing two systems.
Where SMS and RCS each stand today
Both channels are worth understanding on their own terms before you weigh one against the other. They sit at different points, and each earns its place for a different reason.
SMS is the floor under every mobile phone. It needs no app, no setup on the recipient’s side, and no particular device. That universality shows in the volume. Americans exchanged nearly 2.2 trillion text messages in 2024, the most since 2020. When a message has to reach everyone, SMS reaches everyone.
RCS has moved from a niche Android feature to a channel at real scale. Google reported more than a billion RCS messages a day in the US in May 2025, after Apple added support in iOS 18. A year later, that number had climbed to 2.5 billion RCS messages sent daily. The growth traces to iPhones joining the channel, which is how Apple’s RCS support in iOS 18 changed the reach math for business messaging.
Together they are the two business messaging channels most organizations will actually use. One reaches every device. The other adds branding and interaction where the device supports it.
How SMS and RCS compare
| SMS | RCS | With Momentum | |
|---|---|---|---|
| Device reach | Every mobile phone, no app or setup. | Android and iPhone with RCS turned on, and growing fast. | Sends RCS where supported and SMS everywhere else, from one campaign. |
| Message content | Text and links only. | Rich text, images, video, buttons, and carousels. | You design the rich version once, and the plain version is generated for fallback. |
| Sender identity | A phone number the recipient may not recognize. | A verified brand name and logo, checked by carriers. | Verified sender setup is handled as part of onboarding. |
| Interactivity | Replies by text. | Tap-to-act buttons, quick replies, and in-message actions. | Buttons and replies route into a shared Teams inbox. |
| Fallback | This is the fallback layer. | Falls back to SMS when a device cannot receive it. | Fallback happens automatically, per message. |
| Where it runs | Wherever your platform sends it. | The same, through an approved RCS agent. | On the Microsoft Teams numbers your team already uses. |
The messages that belong on SMS
Some messages belong on SMS by default. These are the cases where universal delivery matters more than anything a richer message could show.
- One-time codes and two-factor authentication: A login code has to arrive on any phone, instantly, with nothing to install, which is exactly what SMS guarantees.
- Time-critical alerts: An outage notice, a fraud hold, or a flight change has to reach every recipient regardless of device or RCS status, so the floor channel is the safe choice.
- First contact with an unknown list: When you cannot confirm which recipients can receive RCS, SMS reaches all of them and keeps the message simple.
- The fallback layer for everything else: Every RCS message needs a plain-text version for the devices that cannot render it, and SMS is that version.
In a managed setup, SMS runs through the same service as everything else. The tool that puts SMS and RCS on the numbers your team already works from sends the code, the alert, and the fallback from one place.
The messages RCS is built for
RCS earns the message whenever the content or the interaction changes the outcome. Knowing when to use RCS comes down to one test: would branding, rich media, or a tappable action make this message land better?
Branded alerts are the clearest case. A payment reminder or a fraud notice that shows a verified brand name and logo reads as legitimate in a way a bare number cannot. The recipient acts instead of hesitating.
Interactive messages are next. A confirmation with an approve button, an appointment with a reschedule option, a product carousel a customer can swipe and tap, an order with a track button and a map. Each one moves the next step into the thread, so the customer never leaves to act on it.
These are the messages worth measuring closely, because RCS reports which messages actually earn a response after they land, not only whether the network accepted them. Once you can see the taps, you can tell which rich messages are worth the design effort.
The interactive side gets more capable when automation sits behind it, which is how RCS and AI work together inside Microsoft Teams to answer a reply or route a request without a person on every thread.
Why the answer is both: RCS-first with SMS fallback
For most organizations, the decision resolves the same way. Run both, lead with RCS, and let SMS catch what RCS cannot reach. That is RCS fallback to SMS working as one design across two channels.
The mechanics are straightforward. You build the message once in its rich form. Where the device supports RCS, the customer gets the full version. Where it does not, the same message arrives as plain text. One send, one list, and both channels covered, the same way sending RCS from the Microsoft Teams numbers your team already works from keeps everything on the phone system you already run.
In practice, the model comes down to three habits:
- Design once: You author the rich RCS message and its plain-text fallback together, so there is nothing to rebuild for the devices that cannot receive RCS.
- Route per message: Codes and universal alerts lead with SMS, branded and interactive messages lead with RCS, and both fall back cleanly.
- Measure and adjust: Because the rich and plain versions run from one campaign, you can compare how each performs and shift the mix over time.
Standing it up follows the steps that take an RCS campaign from setup to launch, from registration through the first send, so the routing logic is set once and runs on its own after that.
Run both channels from the numbers your team already uses
The channel decision is only half the work. The other half is running both without standing up a second system to do it, and that is where the delivery model matters as much as the message.
Momentum Messaging, powered by Clerk Chat, is a managed messaging service that runs inside Microsoft Teams, sending RCS business messaging and SMS from the numbers your team already calls and texts from.
The rich message, the fallback, the verified sender, and the reporting sit in one place. You get one provider, one bill, and one team standing behind the whole thing, so there is no seam between the channel that reaches everyone and the channel that does more.
Match every message to the channel that fits it, without running two systems to do it. Try RCS on your own phone and see what it looks like next to a plain text.
FAQs
What is the difference between SMS and RCS?
SMS sends plain text and links to any mobile phone, with no app or setup. RCS adds branding, images, video, buttons, and read receipts, but only on devices that support it and have it turned on. SMS reaches everyone, and RCS does more where the phone allows it. Most business messaging uses both.
Should you use SMS or RCS for your business messages?
Use both, matched to the message. Lead with RCS for branded, interactive, or media-rich messages where it lifts the response. Use SMS for one-time codes, universal alerts, and any message that must reach every device. RCS delivers the richer version where supported, and SMS covers the rest, so you do not have to choose once.
Does RCS replace SMS?
No. SMS remains the universal floor and the fallback layer beneath RCS. When a device cannot receive an RCS message, it arrives as SMS instead, so the two run together, with RCS layering on top of SMS where the device allows. Planning for both is more reliable than betting on RCS reaching every recipient.
What happens if a customer’s phone does not support RCS?
The message falls back to SMS automatically. In a managed setup, you design the rich RCS version and its plain-text version together, and the system sends whichever the device can receive. The customer still gets the message, and the phone determines the format. There is nothing separate to build for non-RCS devices.
Is RCS more secure than SMS?
For business messaging, RCS trust rests on a verified sender identity and carrier verification, so the recipient can confirm the message comes from a real brand. The cross-platform end-to-end encryption that began rolling out in 2026 covers personal one-to-one chats, not brand-to-customer messaging. SMS offers no verified sender, which is part of why unknown numbers get ignored.
Can you run SMS and RCS from Microsoft Teams?
Yes. A managed service can add both channels to your existing Microsoft Teams numbers, so staff send and receive SMS and RCS from the same place they already handle calls. The rich message, the SMS fallback, the verified sender, and the reporting run as one service, under one provider, rather than as separate tools.
