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February 13, 2026

What Is RCS messaging? RCS Chat vs SMS and MMS

Rich Communication Services chat adds extra features to texting, like high-res media, read receipts, and typing indicators.

Written by Kathy Hinson
What Is RCS messaging? RCS Chat vs SMS and MMS

Rich Communication Services (RCS) is a newer kind of text messaging that’s an upgrade from traditional Short Message Service (SMS) and Multimedia Messaging Service (MMS). It lets you send high-resolution photos and videos, see when someone is typing, and more.

Key features of RCS messaging

  • High-resolution media sharing: Send high-quality photos, videos and audio; media files can be up to 100MB. 
  • Real-time interaction: Read receipts and typing indicators let you know when your message has been seen and when someone’s working on a reply. 
  • Emoji reactions: Respond to a message quickly, you can do a “tapback response” to react with an emoji. 
  • Enhanced group chats: Support for group chats with up to 100 participants.  
  • Business messaging tools: Business-friendly options include custom branding, analytics, and the ability to include files like maps or tickets. 
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How does RCS chat compare to SMS and MMS?  

Texting has come a long way since its invention more than 30 years ago. It started with SMS messages, which are short and can only include text, then evolved with MMS messaging, which added the ability to send emoji, images and multimedia files. 

RCS added even more features and by late 2019 was the default Android messaging platform. In late 2024, Apple joined the party by adding RCS support to iOS 18.

RCS messaging MMS messaging SMS messaging
3,072 character limit for text 1,600 character limit for text 160 character limit
Allows high-res videos, images, audio files Allows high-res videos, images, audio files No images or audio, plain text only
Uses internet (Wi-Fi or mobile data) Uses mobile data and the cellular network Uses cellular network
Interactive features:
  • Typing indicator, read reciepts.
  • Emoji "tapback" reactions.
  • Up to 100 group chat participants; all participants see all responses.
 Interactive features:
  • Typing indicator, read reciepts.
  • Emoji "tapback" reactions.
  • Group chats among 10-20 people, depending on carrier; all participants see all responses.
 Interactive features:
  • Group chats among a limited group, generally 20-25 depending on carrier; participants only see their own responses, not everyone's.
Requires smartphone Requires smartphone Works with almost all mobile devices, not just smartphones

How does RCS chat work?  

RCS messages depend on an internet connection, so you need to be on Wi-Fi or have a phone plan with data. To carry on a conversation with RCS, you need these elements:  

  • Your phone must support RCS: Androids on 5.0 or later and iPhones on iOS 18 or later are RCS compatible, as are most Pixel phones.  
  • Your phone carrier may need to support it, too, unless you’re using Google Message. The Big 3 networks (AT&T, T-Mobile, Verizon) all support RCS chat, as do many of the smaller service resellers called MVNOs.
  • You need to be somewhere RCS is available. It's not yet in all regions of the U.S.  

  • You may need to enable RCS messaging on your phone. The recipient or recipients (everyone in the chat) need to have RCS messaging enabled on their phones, too. If a recipient doesn’t have RCS chatting or there are connectivity issues, messages will simply revert to SMS or MMS.

How to turn on RCS messaging

  • On an Android: Go to Google Messages, tap your profile picture, then tap Message settings. Select RCS chats and enable.  
  • On an iPhone: Open Settings -> Apps -> Messages. Under Text Messaging, tap on RCS Messaging and toggle it on.  

  >> Read more: Guide to the best free texting apps

What are the advantages and disadvantages of RCS messaging? 

RCS chatting adds a lot of functionality but also brings some considerations. The most notable one is encryption. RCS messages between Google Message users are end-to-end encrypted but iPhone RCS messages are not; instead, iPhone users must use iMessage to get that level of encryption. And messages between iPhones and Androids are not encrypted.  

Pros of RCS messaging Cons of RCS messaging
  • High-quality sharing of images, video and audio.
  • File size up to 100MB.
  • Interactivity (typing indicator, quick tapback response, read receipts).
  • Enhanced group chatting and larger groups.
  • End-to-end encrypted between Google Message users.
  • Only works if both/all users have it enabled.
  • Your carrier or region might not yet support it.
  • Uses an internet connection, so you need to be on Wi-Fi or have a plan with mobile data.
  • May transmit sensitive data like your number, IP address and device info.
  • Not end-to-end encrypted for conversations between iPhones or mixed iPhone/Android chat.

>> Read more: What is a GB, and how many MB in a GB? 

Is RCS messaging safe?  

As mentioned above, the contents of RCS messages may or may not be end-to-end encrypted, depending on what platform and devices are being used. Best practices if you’re worried about RCS messaging security include: 

  • Avoid sharing sensitive material, like financial info, over RCS. 
  • To ensure encryption, Android users could limit themselves to communicating with other Google Message users, and iPhone users could stick to iMessage.  
  • Consider using a platform that emphasizes security instead, such as Signal or WhatsApp. 

In addition, RCS messaging can transmit sensitive metadata you’d rather not share: IP address, phone number, device info. That’s true even when the message content is end-to-end encrypted: RCS uses carrier networks, so it needs to identify you and your device to allow access. Again, if this gives you pause, you might want to use a private texting app like Signal, which has metadata protection software called Sealed Sender.  

How do I turn off RCS? 

If you decide you’d rather not use RCS chat, you can toggle it off using the path you used to enable it. A few things happen if you turn off RCS messaging:  

  • You’ll be removed from group RCS chats. 
  • Media you send via text (photos, videos, audio) may have lower quality for the recipient, and the maximum file size drops from 100MB to 5MB.  
  • Messages will not be encrypted unless you use an app like Signal or WhatsApp or stick with iMessage. 

Android users should turn off RCS before switching to a new phone to avoid verification difficulties.  

Frequently asked questions about RCS messaging 

Have questions or comments? Send us a note at [email protected]!

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