SMS vs MMS vs RCS: Key Differences for B2C Marketers

Choosing the Right Mobile Message

Generated by Klaviyo AI

SMS prioritises reach and speed, MMS adds simple media, and RCS provides verified branding, rich content, and interactive features. The right format depends on the campaign, device support, and whether simplicity or a more immersive customer experience matters most.

SMS for reach: SMS delivers dependable, text-only messages with a 160-character limit over carrier networks.
MMS for media: MMS supports images, GIFs, and longer text for straightforward multimedia campaigns.
RCS for interaction: RCS supports high-resolution media, buttons, carousels, verified branding, read receipts, and suggested replies.
Reliable fallback: When a subscriber cannot receive RCS, automatic SMS or MMS fallback maintains delivery.

SMS and MMS have served marketers well as standard promotional channels that reach customers with brief, urgent messages.

RCS offers a rich, interactive messaging experience that mirrors how today’s consumers browse and shop online. Think of RCS as a shoppable texting experience rather than as a text message.

So, what exactly is RCS? How is it different from SMS and MMS? And how should you use it as part of your mobile strategy? Let’s break it all down, so you can confidently choose the right message type for your next campaign.

What is RCS, SMS, MMS?

Before we get into strategy, here’s a quick refresher on each message type:

RCS (Rich Communication Services): RCS allows for high-resolution media, interactive buttons, brand verification, and read receipts, all sent over mobile data or Wi-Fi.
SMS (Short Message Service):SMS is a basic form of text message sent over carrier networks. SMS does not include other media, and it has a 160-character limit per message.
MMS (Multimedia Messaging Service): MMS can include images, GIFs, and longer texts, and is sent over carrier networks.

With RCS now supported on both Android and iOS (starting with iOS 18), it’s positioned to become the global default messaging experience for consumers.

RCS vs. SMS vs. MMS: the breakdown

	RCS	SMS	MMS
Media support	HD images, video, GIFs, audio up to 100MB	Text and emojis	Images, audio, video, GIFs up to 300KB
Character limit	Up to 3,072	160	~1,600 (varies by carrier)
Deliverability	Dependent on carrier support, device compatibility, and user settings	High	Dependent on regional and carrier-specific limitations
Sending speed	Faster speeds over mobile data and Wi-Fi networks	Standard speeds	Slower than SMS (due to media)
Branding	Verified profile, logo, contact information (website, email, phone number)	Contact cards	Contact cards
Read receipts	Yes	No	No
Interactive elements	Buttons, suggested replies, cards, carousels	Keyword-based replies	No
Click tracking	Native click receipts	Partial (with UTM)	Partial (with UTM)
Delivery fallback	Auto-fallback to SMS/MMS if unsupported	N/A	N/A
Reach	Growing (Android and iOS 18+)	Universal	Region-specific

How RCS enhances customer relationships

RCS excels in cases where rich content and interactivity are key, such as product launches, promotional offers, or service interactions. But SMS remains a reliable, cost effective option for high-volume notifications like shipping updates, order confirmations, or time-sensitive alerts, where the priority is speed and simplicity.

Use SMS when you need dependable reach, MMS for simple media moments, and RCS when you want a more branded, interactive experience where it’s supported. If someone can’t receive RCS, automatic SMS/MMS fallback keeps delivery reliable.

1. Deliver richer, high-converting content

Think of RCS as a mobile storefront. You’re not just sending a message—you’re guiding your customer through an interactive shopping experience.

RCS supports rich visuals, motion, carousels, buttons, and formatted text. You can create immersive product showcases, event promotions, or limited-time offers—all without needing a browser or app.

2. Build trust with a verified brand presence

Verified branding is a trust signal that drives opens, replies, and conversions. RCS business profiles feature your logo, brand name, and verified status, building instant credibility and reducing opt-outs.

Note that, with RCS, certain compliance features don’t take up character count, which means brands have more space for promotional experiences. For example, with RCS, there is no org-prefix required, and subscribers can opt out via a button—requirements that previously ate up precious real estate within a text.

3. Optimise performance with deeper insights

RCS gives you real-time feedback with read receipts, click tracking, and delivery confirmations. Note that Klaviyo integrates this data with fallback SMS reporting, so you get a complete performance picture across your text messaging campaigns.

With RCS, you can also send more messages in a shorter amount of time. This is because RCS is sent over data networks and therefore has much higher throughput.

4. Drive personalisation with suggested replies

Suggested replies aren’t just convenient—they’re actionable. Use them to capture preferences, gather zero-party data, and trigger reply-based flows and automations. With RCS, every reply is a signal and a conversion opportunity.

When to use RCS, SMS, or MMS in your marketing

RCS delivers a more branded, interactive, and seamless experience across campaigns and touchpoints.

There are two types of RCS message:

Basic RCS: Basic RCS can support all of the same SMS use cases as it has the same limitations (i.e., no media and 160 char limit).
Single RCS: Single RCS is any RCS message over 160 characters or one that includes rich features like cards, carousels, media, buttons, etc.

Here are some of the most common use cases for both types of RCS message:

Use case	Recommended format	Why
Flash sale, reminder, or alert	Basic RCS	Basic RCS has the same character limit as SMS, but it’s sent from a verified brand and has higher delivery throughput.
Product sneak peek or visual promotion	Single RCS	Brands can add imagery, GIFs, and interactivity to drive attention and engagement.
Product launch or holiday campaign	Single RCS	Brands can use rich media, carousels, and CTAs to create branded, immersive moments.
Order confirmation or delivery update	Basic or single RCS	Brands can use basic RCS for simple updates and single RCS for richer confirmations or tracking links.
Back-in-stock notification or abandoned cart reminder	Single RCS	Visuals and smart replies increase conversion.

RCS tip: RCS can reduce opt-outs because it uses a branded interface and native opt-out buttons, meaning there’s no need to waste characters on links or disclaimers. And because RCS is sent over mobile data networks and Wi-Fi, the format also supports faster, more scalable message delivery.

If a subscriber doesn’t support RCS, Klaviyo automatically falls back to SMS or MMS, ensuring full reach without fragmented threads or duplicated conversations.

How to get ready for the RCS shift

RCS is more personal and interactive than SMS and MMS, but you still won’t want to use it alone. As part of your omnichannel strategy, RCS is most effective when you’re also using email, push, social, and mobile app messaging to create consistent, channel-agnostic journeys that meet your customers wherever they are.

Also note that brands who shift their strategy and resources to accommodate RCS will gain early adopter advantage. Brands that get a head start will be in a better position to exceed customer expectations by offering the personalised brand experiences they’ve come to expect.

Ready to see how RCS messaging can transform your marketing and customer service?

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Frequently asked questions

What's the difference between SMS, MMS, and RCS?

SMS sends plain text to almost any phone, capped at 160 characters. MMS adds images, GIFs, audio, and video over the same carrier networks. RCS adds verified branding, richer media, and interactive elements like buttons and carousels where the device supports it, and falls back to SMS or MMS where it doesn't.

What's the difference between RCS and SMS?

SMS is built for reach and speed: short, text-only messages that land on virtually every phone. RCS is built for the experience: verified sender branding, rich media, and in-message interactivity, with automatic SMS fallback for anyone who can't receive it.

What does it take to start sending RCS messages?

You register an RCS agent, which is a verified business profile with your brand name, logo, and contact details, then submit it for Google and carrier approval. Once it's approved and activated, RCS-capable devices get the rich version and everyone else gets an SMS or MMS fallback.

Tracey Wallace

Tracey is the director of content strategy at Klaviyo. Previously, she led marketing teams for early stage start-ups from $0 to $20M in revenue, and was the former Editor-in-Chief at BigCommerce, where she helped usher in the era of omnichannel retail. She started her career in journalism at Elle.com and Mashable, reporting on the convergence of fashion and technology––or what we all call today, "ecommerce."

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The difference between RCS vs. SMS vs. MMS: what B2C marketers need to know