RCS suddenly changing to SMS? Everything you need to know

Rohit Jain

Oct 17, 2024

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4 min read

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Articles

TLDR: Why RCS switches to SMS

RCS switches to SMS because your phone is trying to deliver the message no matter what. If the recipient can’t receive RCS, your data connection is weak, RCS is “Disconnected,” or your app is set to auto-fallback, the chat can revert to SMS/MMS. Fixing it is usually about connectivity, settings, and carrier compatibility.

RCS vs. SMS: What's the difference?

Before getting to the reason behind why RCS is switching to SMS, it is good to have an understanding on how these two messaging protocols work. Let’s get started.

RCS: The messaging upgrade we badly needed

Picture this: you're texting your friend, and suddenly, you can see when they're typing, your images are crystal-clear, and you can even react to messages with emojis. No, you haven't magically switched to a new app – you're using RCS, the turbocharged version of SMS!

RCS takes the basic SMS experience and gives it a major power-up. If you’re new to RCS, here are the things you can do with it:

Send high-resolution photos and videos

View read receipts

See typing indicators when a person is responding to your message

Group chats

Video calls and many more.

The best part? RCS works right within your phone's default messaging app. But, the catch is that it requires a Wi-Fi or mobile data connection for its function.

To know more about the differences between RCS and SMS, check out out comprehensive guide on RCS vs SMS.

SMS: Hello, old friend!

SMS, or Short Message Service, has been our trusted messaging companion for years, and for good reason.

The popularity of SMS is because of its simplicity and compatibility. It works fast, easy to send, and works on any phone - anywhere there's a cellular signal. It may not have all the fancy features of RCS, but it gets the job done.

SMS has been a reliable communication method for decades, and it remains a go-to for many people, especially in areas with spotty internet coverage.

Key differences between RCS and SMS

Here are the main distinctions between these two protocols:

Feature	RCS	SMS
Compatibility	Requires compatible device and network	Works on any phone
Capabilities	Supports group chats, high-resolution media, read receipts, typing indicators	Text-only messaging
Network	Uses Wi-Fi or mobile data	Uses cellular networks
Security	Offers end-to-end encryption	Less secure, no encryption

Why does my phone switch from RCS to SMS?

Now that we understood the difference between RCS and SMS protocols, let’s dive into the common reasons that could cause your phone to switch from RCS to SMS.

1. Compatibility issues

One common reason for the RCS-to-SMS switch is compatibility. If you're messaging someone whose device or carrier doesn't support RCS, your phone will automatically fall back to SMS to ensure your message gets through.

This also applies in some cases where your recipient is using an older version of the RCS app.

2. Network limitations

RCS depends on a data connection, so if you're in an area with poor or no Wi-Fi/mobile data, your phone will revert to SMS, which only needs a cellular signal.

3. Message sending failures

If an RCS message fails to send after multiple attempts, your phone may try resending it as an SMS to improve deliverability.

Changing RCS to SMS on your Android phone: Step-by-step guide

If you want to switch from RCS to SMS, follow these steps:

Open the Messages app on your Android device.
Click on your profile icon on the top right corner and click on Messages Settings.
Navigate to General > RCS Chats
Toggle off "Turn on RCS chats".
Confirm the change when prompted.

Troubleshooting tips

Ensure you have the latest version of Messages installed.

Check that your carrier supports RCS.

If issues persist, try clearing your messaging app's cache and data.

While sudden changes from RCS to SMS can be confusing, it's usually just your phone trying to ensure your messages are delivered. So, don’t worry about it.

Recommended Read: RCS vs iMessage

Will RCS replace SMS?

While RCS offers a more modern messaging experience, it still has to go a long way in terms of stability, compatibility, and adoption. Until then, it is very likely that both RCS and SMS will coexist for the foreseeable future, with RCS gradually gaining ground as more devices and networks adopt it.

Elevate your business messaging with Fyno's RCS Solutions

Are you a business looking to harness the power of RCS for your messaging campaigns? Look no further than Fyno! Our cutting-edge platform is designed to help you create, manage, and optimize your RCS messaging strategy with ease.

With Fyno, you can:

Seamlessly integrate RCS and SMS: Our intelligent routing system ensures your messages are delivered via the best available protocol, be it RCS or SMS, based on each user's device compatibility. No more worrying about fragmented messaging experiences!

Maintain brand consistency: Fyno's centralized template management allows you to create on-brand, engaging messages that look great on both RCS and SMS. Keep your brand voice consistent across all touchpoints.

Gain valuable insights: Our powerful analytics dashboard gives you real-time data on your messaging performance. Track key metrics, identify trends, and make data-driven decisions to optimize your campaigns.

Maximize efficiency: Fyno's intuitive interface and robust APIs make it easy to manage your messaging workflows without heavy reliance on developers. Save time and resources while still delivering top-notch messaging experiences.

Scale with confidence: Whether you're sending a hundred messages or a million, Fyno's infrastructure is built to handle high-volume messaging with reliability and speed. Focus on growing your business, not worrying about technical limitations.

Ready to take your business messaging to the next level? Sign up for Fyno today and discover the difference our platform can make. Say hello to smarter, smoother, and more impactful messaging campaigns!

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Frequently Asked Questions

Why did my RCS messages suddenly turn into SMS?

Because RCS isn’t guaranteed in every situation. If your data connection drops, your RCS status disconnects, the recipient can’t receive RCS, or your phone is set to auto-resend as SMS/MMS, Messages falls back to SMS to get the message delivered. This is normal behavior—your phone prioritizes delivery over features.

How do I stop Google Messages from auto-sending SMS when RCS fails?

Turn off “Automatically resend as text (SMS/MMS)” in Google Messages: Profile icon → Message settings → RCS chats → toggle off Automatically resend as text. Keep in mind this may increase “message failed to send” prompts if RCS is unreliable—because you’ve told the app not to fall back.

Does RCS always have end-to-end encryption?

No. Google states RCS chats use TLS encryption even when end-to-end encryption isn’t available, and end-to-end encryption depends on the specific setup (client support and conversation conditions). So RCS can be “more secure than SMS,” but it’s not universally end-to-end encrypted in every scenario.

Why does RCS work on some contacts but not others?

RCS requires compatible endpoints: the recipient must have RCS enabled and supported by their device/app/carrier configuration. If they don’t, Messages uses SMS/MMS as a fallback. This is especially common across mixed ecosystems (Android/iPhone), depending on iPhone RCS availability and carrier support.

Can iPhones use RCS now?

Yes—Apple supports RCS on iPhone with iOS 18+ where the carrier supports it, and users can enable it in Settings. If RCS isn’t available, Messages falls back to SMS/MMS. Feature availability can vary by carrier and country.

My RCS status says “Trying to verify” or won’t connect—what should I do?

This often points to a verification/registration issue in Google Messages. Update the app, check your carrier support, confirm your number can be verified, and try basic network resets (airplane mode, reboot). Some users have experienced recurring verification bugs that keep RCS stuck.

Why does auto-fallback sometimes not work even when it’s enabled?

Users have reported cases where “Automatically resend as text” doesn’t reliably switch on its own, requiring manual resend as SMS/MMS. If you see this often, it’s worth checking for app updates and reviewing your network stability and RCS connection state.

Will SMS disappear once RCS is everywhere?

Unlikely in the near term. Even as RCS adoption grows (including iPhone support), SMS/MMS remains the universal fallback when data is unavailable or RCS isn’t supported. The practical future is hybrid: RCS when possible, SMS when necessary

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