RCS vs SMS: Understanding the Difference

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Satyam Gupta

mins read

October 18, 2023

Key Takeaways

  1. RCS and SMS both are the subset of A2P ecosystem
  2. SMS has been in place since 1992 and Covid gave a big push to the A2P SMS industry via SMS API providers
  3. The fundamental difference between SMS and RCS is that RCS supports rich media unlike SMS
  4. RCS represents evolution of business messaging which is more interactive and engaging like OTT channels
  5. Although simplicity is SMS's strong suite, RCS will see rapid adaptability among businesses

In the world of mobile communication, SMS (Short Message Service) has been a staple for decades. However, with the advent of new technologies and the increasing demand for richer messaging experiences, RCS (Rich Communication Services) has emerged as a powerful contender.  

In this article, we will explore the differences between SMS and RCS, their respective features and capabilities, and how they are shaping the future of mobile text messaging.

Evolution of SMS


SMS, also known as text messaging, has been a fundamental feature of mobile phones since its inception in 1992. It has become ubiquitous and is supported by virtually every mobile device, including feature phones and smartphones.

One of the key characteristics of SMS is its simplicity. Messages are limited to 160 characters, and they can contain letters, numbers, symbols and are perfect for use cases like OTP SMS using SMS verification service. SMS does not support media attachments such as images, videos, or audio files. It was primarily designed for sending plain text messages, making it ideal for quick and efficient communication using an SMS API provider.

Although SMS has certain limitations, it remains widely used due to its:-

a. Reliability,

b. Compatibility, and

c. Low cost

Carriers often charge users per SMS sent, but receiving SMS messages is usually free. Despite the rise of instant messaging apps and social media platforms, SMS continues to play a crucial role in everyday communication although now in competition with RCS i.e. RCS vs SMS.

Introduction to RCS

Labeled as text messaging 2.0, Google featured it at  Mobile World Congress 2017. While SMS has remained relatively unchanged, the demand for more advanced messaging capabilities led to the development of RCS. Rich Communication Services is an upgrade to traditional SMS and MMS (Multimedia Messaging Service). It aims to provide users with a more interactive and feature-rich messaging experience.

RCS offers a range of modern features that go beyond the limitations of SMS. With RCS, users can send and receive high-quality images, videos, GIFs, and audio files. They can also share their location, participate in group chats, and receive read receipts. Additionally, RCS supports typing indicators, which let users know when someone is composing a message.

Google introduced RCS as an alternative to Apple's iMessage, which offers similar features but is limited to Apple devices. RCS is designed to work on Android devices and is built into the default messaging app on many smartphones. Its goal is to provide Android users with a native messaging experience that rivals the capabilities of iMessage.

If you wish to use RCS for business communication, you can get in touch with the team at Message Central to get complete assistance.

Feature Comparison: RCS vs SMS

When comparing SMS and RCS, it becomes clear that RCS offers significant advantages in terms of features and functionality. Let's take a closer look at some of the key differences between the two communication protocols:

  • Character Limit: SMS messages are limited to 160 characters, while RCS has no practical character limit. Users can send longer messages without them being split across multiple texts.
  • Media Attachments: SMS does not support media attachments, while RCS allows users to send images, videos, audio files, and GIFs. This enables richer and more engaging conversations.
  • Group Chats: RCS supports group chats, allowing multiple participants to communicate in a single conversation. SMS does not offer this feature.
  • Typing Indicators: RCS provides typing indicators, which show when someone is typing a message. This real-time feedback enhances the conversational experience.
  • Read Receipts: RCS allows users to see when their messages have been delivered and read by the recipient. SMS only provides delivery receipts.
  • Encryption: While SMS messages are not encrypted, some RCS apps offer end-to-end encryption for increased security and privacy.
  • Business Applications: RCS offers a range of business-centric features such as business branding, custom reply to actions, rich information cards, and QR codes. These features enable businesses to engage with customers in more interactive ways.

Network Requirements: RCS vs SMS

a. SMS relies on the cellular telephony network for transmission. It requires a cellular signal connection, which means it may not be available in areas with poor or no network coverage. However, SMS or SMS API has broader reach and can be sent and received between different carriers and devices.

b. RCS, on the other hand, utilizes the data network (cellular data or Wi-Fi) for transmission. This means that RCS messages can be sent and received if there is an internet connection, regardless of cellular signal strength. However, RCS requires both the sender and the recipient to have RCS-enabled devices and be on carriers that support RCS.

Media Support: RCS vs SMS

a. One of the significant limitations of SMS is its inability to support media attachments. SMS messages are limited to plain text, making it impossible to send images, videos, or any other media content. This restricts the expressive capabilities of SMS and limits its use for multimedia-rich communication.

b. RCS, on the other hand, allows users to send and receive a wide range of media content. Users can share images, videos, audio files, GIFs, and even their location. This opens up new possibilities for more engaging and visually appealing conversations.
The ability to send media attachments through RCS enhances communication by allowing users to share moments, express emotions, and convey information more effectively. It brings messaging closer to the multimedia-rich experiences offered by popular instant messaging apps.

Encryption and Security: RCS vs SMS

a. When it comes to encryption and security, SMS falls short compared to RCS. SMS messages are not encrypted, which means they can potentially be intercepted or accessed by unauthorized parties. This lack of encryption leaves SMS vulnerable to privacy and security breaches.

b. RCS, on the other hand, offers end-to-end encryption for some of its messaging apps. This means that messages sent and received through RCS can only be read by the intended recipients. End-to-end encryption ensures that the content of the messages remains private and secure.
However, it is important to note that not all RCS apps support end-to-end encryption. Users should choose RCS apps that prioritize security and privacy to ensure their messages are protected.

Business Applications: RCS vs SMS

a. SMS has long been used by businesses for various purposes, including marketing, notifications, and customer support. Its simplicity and wide availability make it an effective tool for reaching customers quickly and efficiently. However, SMS is limited in terms of the content it can deliver, making it less engaging for customers.

b. RCS offers a range of features that make it more suitable for business applications. With RCS, businesses can send branded messages, include interactive elements such as buttons and carousels, and provide rich information cards. These features enable businesses to create more compelling and visually appealing messages that capture customers' attention.
RCS also allows businesses to gather valuable insights through analytics and measure the success of their marketing campaigns. They can track key metrics such as conversions, open rates, and engagement, enabling them to optimize their messaging strategies and improve customer interactions.

RCS Adoption and Availability

While RCS offers significant advantages over SMS, its adoption and availability have been a challenge.

a. RCS requires both the sender and the recipient to have RCS-enabled devices and be on carriers that support RCS. This has limited its widespread adoption and interoperability.

b. One of the main obstacles to RCS adoption is the lack of support on Apple devices. iPhones do not natively support RCS and this limits the reach of RCS and creates a fragmentation in the messaging landscape. Although, Apple has indicated plans to implement it.

However, major mobile carriers and smartphone manufacturers have been working to promote RCS and make it more accessible to users. Many Android devices come with RCS messaging built-in, making it easier for users to take advantage of its features. Additionally, carriers around the world are gradually rolling out RCS support, expanding its availability.  

The Choice: RCS vs SMS

When deciding between SMS and RCS, several factors need to be considered. SMS remains a reliable and widely supported communication protocol that is available on virtually all mobile devices. It is suitable for simple and text-based messaging where media attachments are not necessary.

On the other hand, RCS offers a more modern and feature-rich messaging experience. It enables users to send and receive multimedia content, participate in group chats, and enjoy real-time communication features. RCS is ideal for users who value richer and more engaging conversations.

For businesses, RCS provides enhanced capabilities for customer engagement and marketing. The ability to send branded messages, include interactive elements, and gather analytics can significantly impact the effectiveness of marketing campaigns and customer interactions.

Ultimately, the choice between SMS and RCS depends on individual needs and preferences. While SMS continues to be a reliable and widely supported communication method, RCS offers a more advanced and immersive messaging experience.

The Future of Messaging

As technology continues to evolve, so does the way we communicate. SMS has been a staple in mobile messaging for decades, but its limitations are becoming more apparent in a world that demands richer and more interactive experiences.

RCS represents the evolution of mobile messaging, offering features and capabilities that bring it closer to the functionality of popular instant messaging apps. With its ability to support media attachments, provide real-time communication features, and enable interactive elements, RCS is shaping the future of messaging.  

For RCS, sometimes you’d receive ‘sent as SMS via server’ as a read receipt. If you’d want to know about the issue in detail, you can head over to our guide – what does sent as SMS via server mean?

While widespread adoption and interoperability remain challenges, RCS has the potential to redefine how we communicate on mobile devices. As more carriers, smartphone manufacturers, and businesses embrace RCS, we can expect to see a shift towards more immersive and engaging messaging experiences.

In conclusion, SMS and RCS are two communication protocols with distinct features and capabilities. While SMS remains a reliable and widely supported method for text-based messaging, RCS offers a more advanced and feature-rich messaging experience. As technology continues to evolve, RCS is poised to reshape the way we communicate on mobile devices, providing users with richer, more engaging, and more interactive messaging experiences.

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