What RCS is and why you might want to switch

RCS (Rich Communication Services) is a messaging standard that works like a bridge between SMS text messages and apps like iMessage or WhatsApp. On iPhone, RCS appears in the Messages app alongside your regular texts. It lets you send larger files, see when someone is typing, get read receipts, and use group chat features — all without leaving the Messages app or asking the other person to read anything new.

RCS only works when both people have it turned on and are using compatible carriers and phones. If the other person is still on SMS, your message falls back to a regular text automatically. You don't lose anything by turning it on — your phone just tries RCS first, then SMS if it's not available.

Apple added RCS support to iPhone starting with iOS 18 in 2024. If you have an older iPhone or an older iOS version, RCS won't be available to you yet, no matter what you do.

Key Takeaways

  • RCS is built into the Messages app on iPhone running iOS 18 or later and turns on automatically for most carriers in the United States.
  • You do not need to read anything or change any settings manually — your phone handles RCS in the background once your carrier supports it.
  • RCS only works between two people who both have it enabled; if the other person uses SMS, your message sends as a regular text instead.
  • If RCS is not working, check that your iOS version is current, your carrier supports it, and you have an active data connection.

Check your iOS version first

RCS on iPhone requires iOS 18 or later. Open Settings, tap General, then tap About. Look for the iOS version number at the top of the screen. If it says iOS 18 or higher, you can use RCS. If it says iOS 17 or lower, you will need to update your phone before RCS becomes available.

To update, go to Settings, tap General, then tap Software Update. If an update is available, tap read and Install. Your phone will restart during the process, so plug it in and make sure you have time for it to finish.

Confirm your carrier supports RCS

Most major US carriers — Verizon, AT&T, T-Mobile, and many regional carriers — support RCS on iPhone. However, some smaller carriers or MVNOs (carriers that lease network space from the big three) may not have turned it on yet. The fastest way to check is to contact your carrier directly or visit their website and search for "RCS iPhone support."

If your carrier does support RCS but it is not working on your phone, try turning airplane mode on for 10 seconds, then off again. This forces your phone to reconnect to the network and can trigger RCS set up.

How RCS appears in the Messages app

Once RCS is active, you will not see a separate toggle or setting for it in the Messages app. Instead, look at the text input box at the bottom of a conversation. When you are chatting with someone who has RCS enabled, the input box will show a small camera icon and a plus sign — these are RCS features that let you send photos and files more easily. With SMS-only contacts, these icons may not appear or may be grayed out.

You can also see RCS status in group chats. If everyone in the group has RCS, you will see typing indicators (the three dots that appear when someone is composing a message) and read receipts (small checkmarks showing when someone has read your message). These features do not work in SMS group chats.

What to do if RCS is not working

If you have iOS 18 or later and your carrier supports RCS, but you are not seeing RCS features, try these steps in order. First, restart your phone by holding the power button until the slider appears, then slide to power off. Wait 10 seconds and turn it back on. Second, check that you have an active data connection — RCS requires either Wi-Fi or cellular data, not just a phone signal.

Third, open Settings, tap Messages, and scroll down to look for any RCS-related toggles. On most iPhones, there is nothing to toggle — RCS turns on automatically — but some carriers may have added a setting. If you see an RCS toggle, make sure it is on. If none of these steps work, contact your carrier's support line and tell them RCS is not activating on your iPhone running iOS 18.

RCS versus iMessage: which one you are using

iMessage and RCS are different systems. iMessage is Apple's proprietary service that works only between Apple devices (iPhone, iPad, Mac). RCS is an industry standard that works across different phone brands. On iPhone, iMessage takes priority — if you are texting another iPhone user, iMessage is used automatically. RCS only kicks in when you are texting an Android user or someone on a non-Apple device who has RCS enabled.

You can tell which one is active by looking at the message bubble color. iMessage bubbles are blue. RCS and SMS bubbles are green. This color coding happens automatically; you do not choose which one to use for each contact.

Frequently Asked Questions

Does RCS cost extra money?

No. RCS uses your existing data plan, just like iMessage does. If you have unlimited texting and data, RCS does not change your bill. Some carriers may charge for international RCS messages the same way they charge for international SMS, so check with your carrier if you send messages abroad.

Can I turn RCS off if I do not want it?

On most iPhones, there is no setting to turn RCS off — it activates automatically once your carrier supports it. If you want to disable it, contact your carrier and ask them to turn off RCS on your account. This is uncommon, but some carriers allow it.

Will the other person know I am using RCS instead of SMS?

No. RCS works invisibly in the background. The other person will not see any notification that you switched from SMS to RCS. They will only notice if they have RCS enabled too — then they will see typing indicators and read receipts, which SMS does not provide.

What happens if I text someone who does not have RCS?

Your message automatically falls back to SMS. You will not see a warning or a choice — your phone handles it. The message sends as a regular text, and you will not have access to RCS features like typing indicators for that conversation.

Does RCS work over Wi-Fi only, or do I need cellular data?

RCS works over both Wi-Fi and cellular data. As long as you have an active internet connection, RCS will function. If you lose both Wi-Fi and data, messages will not send until your connection returns.