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Original poster
Apr 12, 2001

Apple in mid-November announced that it will adopt Rich Communication Services (RCS) in 2024, upgrading messaging standards for non-iMessage conversations. Apple's news came as a shock because Google had been aggressively pushing Apple to implement RCS for multiple years, but Apple hadn't budged.


This guide explains everything that you need to know about RCS, including how it works, how you'll use it on Apple devices, why Apple decided to adopt it now, and the benefits that you can expect to see when support is added.

RCS Explained

Rich Communication Services, or RCS, is a communication protocol developed by the GSM Association and championed by Google. As a communication protocol, RCS is used by smartphone manufacturers and carriers to deliver text-based messages, images, and videos between devices. It's basically what will power the text messages that you send to people with your iPhone and other Apple devices.

RCS is a replacement for SMS (Short Messaging Service) and MMS (Multimedia Messaging Service), both of which are used for data sharing over cellular networks. RCS combines the features of SMS and MMS, and adds additional functionality. It will be what allows you to send texts to people who don't have iPhones for iMessage.

RCS Features

There are a number of benefits to RCS compared to the prior MMS and SMS features. Much of the improvements will be seen in iPhone to Android chats because for conversations between Apple device owners, iMessage will continue to be the default.
  • Support for higher resolution photos and videos.
  • Support for larger file sizes and file sharing.
  • Audio messages.
  • Cross-platform emoji reactions.
  • Real-time typing indicators.
  • Read receipts.
  • Ability to send messages over cellular or Wi-Fi (SMS is cellular only). There is no cost to send an RCS message over Wi-Fi.
  • Improved group chats.
  • Better security. Google's version of RCS has end-to-end encryption, which Apple does not intend to use. Apple will instead work with the GSMA to develop a more secure form of encryption that is baked natively into RCS.

SMS or Short Messaging Service is supported by almost all mobile phones, and it is designed to allow you to send text messages from device to device. It is accompanied by the Mobile Messaging Service extension that supports photos, videos, and longer text messages. Both of these standards have been around for more than two decades and have fallen behind more modern chat apps in terms of features.

RCS is essentially a modernized version of SMS/MMS that carriers and smart phone manufacturers started adopting right around a decade ago, but it has taken time for it to be supported and not all companies have added support (such as Apple), so the more universal (and more limited) SMS/MMS standards have stuck around too.

Perhaps one of the biggest changes is the way that SMS/MMS and RCS work. SMS and MMS are carrier supported and require a cellular connection to function. RCS is supported by carriers, but RCS messages can be sent over a cellular or Wi-Fi connection, similar to iMessages, so there's no specific cellular connection requirement.

RCS is in fact much more like WhatsApp, iMessage, Messenger, and similar chat apps, but baked into a smartphone's default text messaging app. It supports features that SMS/MMS do not, like typing indicators, high-resolution images, file transfers, and video calls.

RCS and iMessage

RCS works alongside iMessage, and it does not replace iMessage. For iPhone to iPhone conversations and texts on any Apple device to another Apple device, iMessage will be the default.

After RCS support is implemented, if you turn off iMessage on your iPhone, it will likely default to RCS on supported devices as that will be the text messaging standard for non-iMessage communications.

iMessage will continue to function exactly as it does now with no change for communications between Apple device users.

What RCS Means for iPhone Users

If you have friends or family members that have an Android device, you'll see an improvement in some of the frustrations that come with cross-platform messaging.

Group texts between Android and iPhone users will be less buggy, and there won't be the same limitations on photo and video size that can cause media not to send. The tapback reactions that you use on an iPhone will have an emoji reaction equivalent on Android, so tapbacks won't be quite as confusing to your Android using friends.

Read receipts and typing indicators will be available for iPhone to Android communications and won't just be limited to iPhone to iPhone iMessages when RCS rolls out.

In general, iPhone owners and those with other Apple devices don't need to think about RCS or worry about it. It's a change that's going to happen in the background with no user interaction required. Communication is not changing between iPhones, and between iPhone and Android users, messaging will be the same, but improved in terms of reliability.

RCS and Android

Text conversations with Android users are the primary way iPhone users will experience RCS when it comes out. RCS will only be available when all participants in the conversation have a device and a carrier that support it, but that should encompass most Android users in the United States.

Android devices have had RCS for some time as Google and Samsung have supported it for several years and were pushing Apple to adopt it.

Right now, sharing photos and videos with Android users can be tricky for an iPhone user, and sometimes photos and videos are too large or won't deliver. There are also often issues with group conversations between Android and iPhone users, both in terms of supported features and stability.

Talking to an Android user should be less of a hassle than it is now when RCS rolls out because features like emoji reactions will be supported, there will be typing indicators, and files and images should not fail to send.

Green Bubbles vs. Blue Bubbles

While it will be less frustrating to communicate with "green bubble" people on an Apple device, chat bubble colors are not changing.

iMessage conversations will continue to be denoted with blue chat bubbles, and RCS messages will continue to be green, the same as SMS/MMS messages are now. Note that SMS and MMS aren't going away. They'll continue to be available on networks that don't support RCS and in situations where RCS is unavailable.

RCS requires all of the devices participating in a conversation to have support for the feature, and the network needs to support it too. So if you happen to message someone who uses... Click here to read rest of article

Article Link: Breaking Down Apple's 2024 Adoption of Rich Communication Services
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macrumors 68000
Apr 19, 2015
At least the blue/green bubble distinctions are remaining to confirm which friends use iPhones vs. which friends are poor.
I wonder if they will indicate where a message is sent by RCA or SMS? unless Ive missed something.

Someone years and years ago told me you can tell which students were which, just by looking at their laptop. If it's a Mac, they are rich. If it was a Thinkpad... they were the smart ones.


macrumors 68040
Jun 6, 2005
I guess this is good as long as my messages never touch Google servers. If they do … sorry Apple you screwed up. I cannot see a single advantage of this over iMessages. Google must have paid some pretty money or their lobbyist paid a lot to some eurocrats and hinted Apple might be forced.


Staff member
Dec 7, 2002
New Zealand
My service provider (in Sweden) doesn’t support RCS and has said that they have no immediate plans of doing so either. Wonder if this will change their minds?
Same here in NZ. One of the providers has said that it'll cost around $3 million to implement RCS and that it's unlikely to happen when so many people already use third-party services and are unlikely to switch away from them.

I really hope they'll figure out end-to-end encryption soon after the initial implementation.
That came up as well. In many countries, providers are required by law to have a backdoor, and therefore they can't offer encrypted RCS.
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macrumors 68020
May 16, 2006
Waterbury, CT
I guess this is good as long as my messages never touch Google servers. If they do … sorry Apple you screwed up. I cannot see a single advantage of this over iMessages. Google must have paid some pretty money or their lobbyist paid a lot to some eurocrats and hinted Apple might be forced.
No one said there was an advantage to this OVER iMessage. There’s a big advantage over SMS though.


macrumors 68030
Feb 28, 2009
Moderate quibble with the headline insinuating Apple is "shifting" to RCS, it is not.
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