What is RCS on iPhone and how it improves messages

If you’ve ever been frustrated sending pixelated photos to an Android friend or not seeing when someone is typing, the culprit was SMS. RCS has changed that on the iPhone and messaging between iPhone and Android finally works like it should. I’ll explain what RCS is on iPhone, how it works, and why it’s such big news.

Table of contents

What is RCS and why does it matter?

RCS stands for Rich Communication Services. It’s the successor to SMS, the messaging system that’s been running since the 90s with barely any changes.

The problem with SMS (and MMS)

SMS has enormous limitations we take for granted:

• Plain text, no formatting
• Photos and videos compressed beyond recognition
• No delivery or read receipts
• Can’t see when someone is typing
• Groups are a mess
• Everything travels unencrypted

For years, iPhone users among themselves had iMessage, which solved all this. But when an iPhone texted an Android (or vice versa), we went back to the 90s with SMS. RCS changes this completely.

What does RCS bring?

RCS adds features we expect from a modern messaging app:

• High-quality photos and videos (without excessive compression)
• Read receipts (when someone reads your message)
• Typing indicator (when someone is typing)
• Longer messages (no character limit)
• Better group chats with names, photos, and management
• Interactive shared locations
• Emoji reactions

My take: RCS on iPhone is the most significant change in mobile messaging in years. I can finally talk to Android friends as if we were on the same messaging app.

How to enable RCS on iPhone

Prerequisites

• iPhone with iOS 18 or later (preferably iOS 19 for the best experience)
• An active SIM or eSIM with data
• Your carrier must support RCS (most already do in 2026)

Steps to enable it

1. Go to Settings > Apps > Messages
2. Look for the “RCS Messaging” section
3. Turn on the “RCS Messaging” toggle
4. The system will verify with your carrier if RCS is available
5. If everything is correct, you’ll see “RCS” next to compatible contacts

How to know if a contact uses RCS

When you open a conversation with an Android user, the text field shows:

• “RCS Message” in green → RCS works between you
• “SMS Message” in green → Your contact doesn’t have RCS enabled yet
• “iMessage” in blue → It’s another iPhone

Tip: If an Android contact doesn’t have RCS, encourage them to update their phone and enable RCS in their Google Messages settings.

Differences: iMessage vs RCS vs SMS

Comparison table

*RCS encryption isn’t end-to-end by default. Google Messages implements it between Androids, but iPhone-Android RCS communication doesn’t always have full encryption.

When does your iPhone use each?

Your iPhone chooses automatically:

• iPhone to iPhone: iMessage (blue)
• iPhone to Android with RCS: RCS (green, but with modern features)
• iPhone to Android without RCS: SMS/MMS (green, basic features)

My real experience with RCS on iPhone

What works well

Photos shared with Android friends: Before, I’d send photos that arrived as a pixelated mess. Now they arrive at near-original quality. This is a huge change.

Mixed groups: I have a group with iPhone and Android friends. Before it was chaos — couldn’t add or remove people easily, reactions became separate messages, and photos arrived as MMS. With RCS, the group works like a normal WhatsApp group.

Seeing when someone is typing: It sounds like a small thing, but knowing someone is typing avoids those awkward moments of “did they reply or not?”

What still falls short

Not universal: Some carriers and regions don’t have RCS fully enabled. If a contact doesn’t have RCS, you’re back to SMS.

Inconsistent encryption: Between iPhone and Android via RCS, encryption isn’t end-to-end like in iMessage or WhatsApp. This is a privacy issue that should improve.

Internet required: RCS needs data or WiFi. No connection means no message (unlike SMS which always works).

RCS vs WhatsApp, Telegram, and other apps

Does RCS make sense if I already use WhatsApp?

Depends on your context. I use both:

RCS is better for:

• Contacts who don’t use WhatsApp or Telegram
• Quick messages without opening another app
• Keeping everything in the native Messages app
• Communicating with older people who only use SMS

WhatsApp/Telegram are better for:

• Guaranteed end-to-end encryption
• Integrated calls and video calls
• Channels, large groups, stickers
• International contacts

My practice: I use RCS for casual messages with friends and family. WhatsApp for large groups and international communication. I don’t see one replacing the other — they’re complementary.

Frequently asked questions

Does RCS work with all Android phones?

Almost. RCS works with Android 5 or later that have the Google Messages app updated and a carrier that supports RCS. In 2026, the vast majority of Android phones ship with Google Messages preinstalled.

Does RCS cost money?

No. RCS uses your mobile data or WiFi, just like WhatsApp. It doesn’t generate additional SMS or MMS charges. If you have a data plan, RCS doesn’t add significant extra cost.

Why are my messages to Android still arriving as SMS?

Check that:

1. RCS is enabled in Settings > Messages
2. Your carrier supports RCS
3. Your contact has an Android with RCS enabled
4. Both have internet connection

If everything checks out but it still fails, try restarting your iPhone and re-enabling RCS.

Will Apple improve RCS in the future?

Yes. Apple has confirmed it will continue improving the RCS implementation. iOS 20 is expected to add end-to-end encryption for RCS, matching iMessage in security.

Conclusion

RCS on iPhone is an improvement that arrived late but transforms communication between iPhone and Android. If you haven’t enabled it yet, do it now: it takes 30 seconds and the difference is immediate. It doesn’t eliminate the need for WhatsApp or Telegram for certain uses, but for everyday cross-platform messaging, RCS is the change we needed.