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What RCS is—and what changed
Rich Communication Services (RCS) is a carrier-supported messaging standard designed to bring richer features to phone-number messaging. The GSMA’s Universal Profile is a common set of features and technical requirements intended to simplify product development and operator deployment. Its capabilities include chat and group chat, file transfer, audio messaging, video sharing, location sharing, multi-device support, business messaging, rich cards, privacy controls, and spam protection. GSMA: RCS Universal Profile
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For years, messaging between iPhones and Android phones commonly fell back to SMS or MMS, while richer features were often confined to a device maker’s service or a separate app. iOS 18 changed that baseline: Apple’s Messages app can use RCS with supported networks, so eligible iPhone-to-Android conversations can offer typing indicators, read receipts, higher-quality media sharing, and improved group messaging. The GSMA described these as cross-platform benefits when RCS Universal Profile is available on both iOS and Android. GSMA, September 17, 2024
When RCS works between iPhone and Android
RCS support is conditional, not a universal switch that makes every text conversation use the standard. Apple says iPhone RCS requires iOS 18 or later and a network provider that supports RCS; availability varies by region and carrier. The recipient’s device and messaging service must also support RCS. Apple Support: About iMessage and SMS/RCS
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- On iPhone: use iOS 18 or later and a carrier that offers RCS in your region.
- On Android: the other person needs an RCS-capable messaging service and network support.
- For group chats: support across participants and providers matters; a conversation can behave differently if someone cannot use RCS.
Apple’s current instructions for checking availability and settings are in its support article. Menu labels and availability can vary by iOS version, carrier, and region, so use the device’s Messages settings and carrier information rather than assuming every iPhone has the same options.
RCS, SMS/MMS, iMessage, and messaging apps compared
| Service | Reach and availability | Features and fallback | Encryption | Business messaging |
|---|---|---|---|---|
| SMS/MMS | Traditional carrier messaging; commonly used when richer services are unavailable. | Basic text and MMS media. It can serve as the fallback when RCS is unavailable. | Not end-to-end encrypted, according to Apple. | Not the rich-card and conversational experience associated with RCS. |
| RCS | Phone-number messaging where device, carrier, region, and service support it. | Can include typing indicators, read receipts, higher-quality media, group chat, file transfer, and more. If RCS is not available, messaging may fall back to SMS/MMS. | Encryption is not universal. It depends on supported implementations and participants; check for the encryption indicator. | Supports branded or verified senders, rich cards, chatbots, privacy controls, spam protection, and conversational commerce. |
| iMessage | Apple’s messaging service for supported Apple devices and accounts. | Richer Apple-to-Apple messaging; it does not provide universal reach to Android devices. | Apple describes iMessage as end-to-end encrypted. | Not the cross-carrier RCS business-messaging standard. |
| Apps such as WhatsApp or Signal | App-based reach: participants generally need the same service and an account or compatible app. | Features, group behavior, and fallback depend on the individual app; they operate separately from carrier RCS. | Use each app’s own security model; do not assume it is identical across apps. | Business features and availability depend on the app. |
This comparison describes the general models; exact functionality can vary by operating system, carrier, country, app version, and settings. RCS is best understood as a richer phone-number messaging path, not as a replacement for every service or a guarantee that all participants share the same features.
Is RCS encrypted?
Not necessarily. Ordinary RCS should not be treated as end-to-end encrypted by default. The GSMA identified interoperable end-to-end encryption as a future milestone in 2024, then published encryption requirements in Universal Profile 3.0 in 2025. In May 2026, Apple announced a supported-carrier rollout in the iOS 26.5 beta. These developments represent staged support, not proof that every RCS conversation is protected. GSMA, 2024 GSMA, Universal Profile 3.0 Apple Newsroom, May 11, 2026
End-to-end encryption for a particular conversation depends on the participants, their providers, and compatible implementations. Look for the encryption indicator in the messaging interface; absent that indicator, do not assume the conversation is end-to-end encrypted. Apple states that SMS/MMS messages are not end-to-end encrypted. Apple Support
Why messages may still be green
On iPhone, green bubbles indicate a conversation is not being sent as iMessage. The green color alone does not tell you whether the message used RCS or SMS/MMS. If RCS is available for that conversation, Messages can use it; otherwise, the message may use SMS/MMS. Check the conversation or Messages settings for the service details and any encryption indicator instead of using bubble color as a security test.
Will RCS replace WhatsApp, Signal, or other apps?
RCS can reduce the need to install a separate app for some routine conversations between phone numbers, particularly when people want richer media and group messaging across iPhone and Android. But it does not establish that users will abandon WhatsApp, Signal, Telegram, or other over-the-top services. Those apps have their own account systems, features, availability, and security models, and RCS support still varies by carrier and region.
Why businesses care about RCS
RCS is also a business-messaging channel, not just an upgrade to personal texting. The GSMA profile includes business messaging features such as rich cards and privacy controls; RCS can support branded or verified sender experiences, chatbots, spam protection, and conversational commerce. This gives organizations a way to put interactive content into a phone-number conversation, where supported, rather than relying only on plain text or a link. GSMA: RCS capabilities
What adoption figures do—and do not—show
EE Times reported an estimated RCS market size of $1.83 billion in 2024 and projected $5.68 billion by 2028. The article also reported more than 1 billion RCS users globally, Google Messages passing 1 billion users sending RCS messages monthly as of November, and a projection that active RCS users would reach 1.1 billion during 2024. These are figures attributed to EE Times’ 2024 coverage, not fresh independent measurements, and the market-size figure for 2028 is a projection rather than a confirmed result. EE Times, 2024
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