RCS vs SMS: What is the Difference?

In 1992, the Short Message Service (SMS) was commercially deployed. Most handset manufacturers at the time didn't hesitate to incorporate this groundbreaking innovation into their software, as it was a simple, fast, and effective way to send messages between cell phones.

It’s been over 30 years since the inception of SMS technology, and the mobile and telecommunications landscape has changed significantly since then. The social media explosion in the 2000s encouraged people to communicate on a massive scale with instant messaging and new features like 'group chat'. Over the last couple of decades, several messaging options have come and gone, but traditional SMS has remained the same.

Although SMS is still fully functional and widely used, with over 23 billion text messages being sent every day, people now want a rich messaging service that’s modern and non-restrictive.

To meet this demand, smartphone manufacturers and carriers have started adopting a service that enriches the traditional SMS. This new texting protocol is called Rich Communication Services (RCS).

Keep reading as we compare RCS vs SMS and explore the advantages and challenges of each type of messaging protocol, particularly from a business perspective. Let’s start with a quick overview of each one.

What is RCS messaging?

RCS was the result of a collaborative effort between the Global System for Mobile Communications Association (GSMA) and other members of the telecom industry. It was built to improve upon the basic messaging capabilities of SMS and MMS.

RCS offers more modern features, such as branded messages, typing indicators, read receipts, group chats and the ability to share content like high-resolution video and audio clips. Furthermore, end-to-end encryption makes RCS more secure than SMS. These and other features put RCS in a similar field to instant or OTT messaging apps such as Facebook Messenger and WhatsApp. RCS texts make it easier for customers to interact with their favourite brands and businesses. They can buy a product, leave a review for a business, or vote in feedback polls, all without leaving the native messaging app.

RCS is an upgrade to the traditional SMS message. It wouldn't be entirely wrong to call it the new SMS protocol. RCS has been dubbed 'SMS 2.0'. In recent years, the adoption and popularity of RCS messaging have rocketed, largely thanks to Google, which provided a route to RCS by integrating the technology into the Messages app on Android devices. RCS offers Android users a competitive alternative to iMessage, WhatsApp, Viber, and other similar instant messaging apps.

Apple's proprietary iMessage service is a well-known rich communication messaging app that offers capabilities similar to RCS features. Many non-Apple mobile devices have also sought to upgrade their messaging capabilities, paving the way for the development and adoption of RCS text messaging.

Related reading: What is RCS Messaging? This is an in-depth article which covers more about the advantages and limitations of RCS, along with the security aspects of both RCS and SMS.

What is SMS messaging?

SMS is the traditional text messaging protocol that allows users to exchange short messages of up to 160 characters of plain text. Longer messages are split into multiple texts. As the oldest and most common way of texting, SMS works on virtually all mobile devices, even basic button-only phones. No internet connection is needed as SMS is transmitted over cellular networks. This makes the reach of SMS far and wide, enabling transmission in remote areas with no Wi-Fi or mobile data.

SMS is often used for everyday texting between individuals. And because SMS is very reliable, many businesses use it for critical notifications, such as one-time passwords (OTPs) and two-factor authentication, as well as for sending brief transactional or promotional messages that don’t require a user response.

SMS vs RCS: What are the differences?

RCS text messages offer a better all-round experience for both businesses and individuals compared to SMS. Here’s how SMS and RCS differ.

Differences for businesses

RCS has the potential to increase engagement and conversions for businesses far better than SMS. Here’s what RCS messaging offers businesses that SMS doesn't.

• Message length: SMS has a strict 160-character limit, whereas RCS has no such limit on message length, allowing businesses more room to get their message across effectively.

• Rich media support / advanced messaging features: While SMS was designed for simple text communication, RCS supports high-quality images, audio, and video sharing — great for product explainers or tutorials. It also enables the use of emojis, GIFs, stickers, and other creative elements.

• Interactive capabilities: RCS offers interactive functionalities such as real-time read receipts and typing indicators that don’t exist in SMS, helping create more dynamic customer service conversations.

• Connection type: The RCS chat service requires an internet connection via mobile data or WiFi to support richer content exchange. RCS text messages don't require a cellular connection from a cell tower as SMS does, which can be both a blessing and a curse. It means SMS messages will have better coverage in off-grid areas or on occasions where a customer is unable to connect to the WiFi.

• Improved delivery and experience: With RCS, messages are delivered faster. There are generally no delays, offering a smoother user experience.

• Security: With end-to-end encryption between Android devices, RCS messaging offers enhanced security against cyberattacks such as interception.

• Campaign analytics: Marketing campaigns can be analysed more effectively by measuring transactions and engagement (not just open rates).

• Native app integration: RCS integrates into the native SMS app, providing a smooth, rich messaging experience right to the customer’s inbox.

• Targeted communication: RCS enables targeting specific groups of customers for tailored messaging, enhancing relevance.

• Real-time updates: Customers can stay informed with real-time order confirmations and updates, ensuring immediate, clear communication without unnecessary delays.

• Enhanced engagement: Due to RCS business messaging offering better targeting and creative opportunities, businesses could boost open rates, user engagement, and, subsequently, conversion rates.

See the key differences between SMS and RCS business messaging at a glance below.

Differences for consumers

RCS messaging is much more engaging and interactive for consumers than SMS, as it provides an app-like experience, rather than static one or two-sentence messages. They can receive product images, cards (message blocks) or carousels that explain things visually and use clear CTA buttons such as ‘Book now’ or ‘Track delivery’.

In turn, these features reduce reading effort, make content feel organised and allow customers to take an action in one tap. RCS also improves trust among customers. Business messages show a verified business name, solid branding and support back-and-forth messaging that feels more human and conversational.

Consumers can receive two-way SMS messages if businesses enable this option, but these only work for short questions and simple conversations, e.g., ‘Reply YES to book’.

For individuals wondering whether to use RCS or SMS, it makes sense to choose RCS for a richer experience—especially since it’s already built into the native messaging app on most modern smartphones.

Cost considerations of SMS vs RCS

Another important aspect to consider when comparing RCS and SMS is the cost of each. For individuals, their mobile phone provider may offer SMS packages or bundles included in their monthly subscription cost. RCS messaging uses data, so charges may occasionally apply from the internet provider for WiFi or the wireless carrier for mobile data, particularly if sending a lot of media-heavy messages.

For businesses, SMS and RCS messaging work on an application-to-person (A2P) model, where messages are sent from a computer to a customer’s phone. SMS messages are generally charged per message, and the cost can add up if you’re sending high volumes of messages. However, there are ways to cut SMS costs to reduce expenses.

RCS business messages are charged based on the types of messages you send (rich or basic) and whether customers reply, rather than a flat per-message rate. RCS pricing is also affected by mobile carriers and countries, so it can be hard to estimate the exact costs.

Ultimately, it’s tricky to officially say which is cheaper: RCS or SMS. But as a business needing A2P messaging for either RCS or SMS, all that’s needed is a quality SMS API provider with access to the best rates possible.

Can RCS replace SMS?

RCS was designed to replace SMS as the default native text messaging service for all phones in the future. But in fact, it’s more of an evolution of SMS, rather than a direct replacement. Most Android devices today already have the RCS chatting feature built in.

When comparing RCS chat vs SMS, the latter was designed for simple communication, but RCS was developed to improve and modernise communication. And it has been successful, to a large extent.

For instance, with features such as high-quality audio and video sharing, secure text communication, group chats, and both in-call and post-call options, RCS offers a far more robust service than SMS.

From marketing to simple notifications, RCS is the way forward for businesses to communicate with their customers. Even before its launch, 74% of consumers (according to a 2018 GSMA market research report) said they would be more likely to engage with a brand through an RCS message. So, RCS looked promising right from the start.

Let’s again consider the delivery mode. As mentioned earlier, unlike SMS, RCS requires an internet connection, either through mobile data or WiFi. This dependency is a double-edged sword. While RCS enables advanced messaging features, it also means that in areas with poor internet connectivity, SMS wins. You can’t deny the reliability SMS offers when having to rely solely on cellular networks.

As mobile communication continues to evolve, RCS is steadily gaining ground. Its rich content messaging capabilities offer significant benefits for both consumers and businesses alike, making it a worthy alternative to SMS now and in the future.

iOS RCS adoption is a key driver

RCS is now available for iPhones. But for years, Apple made few comments about RCS and didn't seem to be considering it for adoption at all. There were a few possible reasons behind their silence, which, to be fair, anyone comparing iMessage vs RCS would understand.

First and foremost, iPhones have, for years, had many of the rich text messaging features that RCS offers. Via iMessage, users can share high-resolution images, videos, and more. It made perfect sense for Apple not to want to prioritise something they've already been offering for quite some time.

Another possible reason was that Apple may have feared that RCS would make iMessage obsolete. A major reason why iPhones are so popular is the iMessage function, and RCS messages would allow iPhone users to communicate with Android phones, undercutting Apple's customer base.

Putting an end to all sorts of speculation, Apple finally broke its silence in November 2023. While a specific date was not promised, the statement said that Apple would adopt RCS "later next year," i.e., sometime in 2024. Apple's spokesperson, speaking with 9to5Mac, said the company was looking forward to the interoperability this decision would bring to all smartphone users, enabling convenient cross-platform messaging for all.

Apple admitted that it was willing to give the RCS protocol a shot despite it falling far behind iMessage in terms of security. In fact, their teams worked with GSMA members to develop a plan to improve the protocol for the benefit of both Android and iPhone users.

As promised, Apple eventually added RCS messaging to iOS in September 2024. At no point did this indicate the end of iMessage. So far, the transition has gone smoothly, and RCS and iMessage have been working well alongside each other.

But… is RCS a real alternative to SMS?

Some people think that SMS is disappearing. Trust in SMS has eroded somewhat in recent years due to text message spam and a lack of end-to-end encryption. And consumers today clearly expect a rich, app-like messaging experience and branded business messages. And so it’s understandable to ask “Is SMS on its way out?” and “Is RCS something that should be taken seriously?” RCS is certainly a real alternative to SMS; however, SMS is still the only universal communication channel, beating email, instant messaging, and social media. The two messaging options are still being used together by consumers and businesses alike.

How to switch from SMS to RCS?

For consumers, switching from SMS to RCS is usually automatic on modern Android phones and iPhones, provided both users have RCS enabled and also have an active internet connection. For instance, if sending a long message with a video attachment, it’ll just automatically send as RCS. RCS is normally enabled by default on new smartphones; however, in some cases, it might need to be enabled manually, such as when RCS has been disabled to troubleshoot delivery issues or to save on mobile data. 

For business text messaging, switching from SMS to RCS involves moving to an ‘RCS where possible, SMS fallback where not’ model. Meaning customers who can receive RCS will get rich messages, and anyone who can’t will still receive SMS.

Businesses can keep their existing SMS programme as long as they already have an RCS-enabled provider (like Messente). There is additional configuration required, as well as going through a business verification process with Google or the mobile carrier directly. Learn more about how RCS for business works.

When RCS isn’t available

Here are some of the most common questions businesses have about RCS if it's disabled or there’s no internet connection.

1. What happens if someone doesn’t have RCS?

When an RCS message is sent to customers who don’t have RCS enabled on their phone, the message automatically falls back to SMS or MMS — behaving just like a regular text. The process runs in the background, and the customer usually receives the message, although not as visually intended.

2. What happens when RCS falls back to SMS?

In most cases, RCS features such as media attachments, typing indicators and read receipts will be lost and the message will be sent as plain text. Message security will also be impacted, as SMS messages aren’t end-to-end encrypted like RCS (via Android-to-Android phones).

While SMS fallback isn’t a huge problem for individual users, it does affect businesses by causing loss of branding and trust, a drop in engagement and conversion rates and a lack of analytics. Furthermore, businesses may see their messaging costs increase if a long RCS campaign is split into multiple 160-character messages (not to mention the confusion broken messages would cause recipients). That said, SMS fallback is considered a business messaging strategy, and there are ways to mitigate the loss of those rich features — like setting up a dedicated SMS fallback message that still includes a CTA.

3. What happens when RCS is turned off?

When sending RCS business messages, the platform first checks whether the recipient can receive RCS. If RCS is turned off in the customer’s app, the check fails, and RCS delivery is ruled out. The messaging platform then makes a routing decision, triggering automatic fallback to SMS or MMS. The RCS message is then converted to SMS as described above. Delivery reporting then reverts to basic insights, and the platform records the send as SMS fallback.

RCS vs SMS: What should you choose for your business

Now comes the all-important question: which is better for business texting, RCS or SMS?

Choosing between these two messaging options ultimately comes down to your business goals and your particular audience.

If you need complete reliability, instant reach, and cost‑effective scaling for sending content such as critical alerts, OTPs, or important reminders, particularly to users in low‑connectivity areas, SMS is the obvious choice. Its universal compatibility and support, along with budget-friendly pricing, make it ideal for high‑volume, transactional messaging where every message must reach the intended recipient.

On the other hand, if you’re running a brand-driven campaign that relies on visual storytelling, RCS Business Messaging is your go‑to. It’s ideal for product launches, flash sales, interactive surveys, and similar campaigns. You can embed rich images and videos, add links, and track user engagement in real time. The trade‑off is that only subscribers on devices and carriers supporting RCS will get the full experience. So you need an SMS fallback plan to cover everyone else.

Therefore, for most businesses, the smartest plan is a hybrid approach. You can default to RCS where possible for maximum impact and easily switch back to SMS when needed. That way, you can deliver the right message in the right format to every customer.

RCS helps businesses do more with text messaging

For consumers, now on both Android and iOS, RCS is a tool that makes SMS messaging more modern, offers the same features as iMessage, and is great for marketing campaigns. The RCS message enhances how customers interact with businesses and opens the door to more complex marketing strategies.

For businesses, RCS is the best way to optimise marketing campaigns to a modern standard. Your business can add high-quality product images with no character limit or other such restrictions. Alas, if the customer's phone is not RCS-enabled, it won't work. Ultimately, this is an ongoing and very real barrier to entry in terms of RCS deliverability.