Why Are Some Texts Blue and Some Green? iMessage, SMS, and RCS Explained

The color of your text bubbles tells you which system the message is using — here's what iMessage, SMS, and RCS mean and why it matters.

In this guide (4 steps):

1.Understand blue bubbles (iMessage)
2.Understand green bubbles (SMS/MMS)
3.What is RCS — the upgrade to SMS
4.What to do when texts are not going through

Understand blue bubbles (iMessage)

~30s

Blue bubbles mean the message is going through iMessage, Apple's own messaging system. iMessage works only between Apple devices (iPhone, iPad, Mac). It sends messages over the internet (WiFi or cellular data) rather than through your phone carrier's text message system. iMessage features: read receipts that show when the other person read your message, typing indicators (the three dots), the ability to send high-quality photos and videos, reactions (heart, thumbs up, etc.), and the message goes through even if the other person does not have cell service, as long as they have WiFi.

Understand green bubbles (SMS/MMS)

~39s

Green bubbles mean the message is using SMS or MMS — the standard text message system that has existed since the 1990s. SMS is used when: you text an Android user, the person does not have iMessage turned on, or your iPhone lost internet connection and fell back to SMS. SMS texts go through your phone carrier and count against your text message plan (though most US plans include unlimited texts). SMS does not support read receipts, typing indicators, or high-quality photo sharing. Group texts over SMS can behave unpredictably.

Quick Tip

When you text someone on Android from an iPhone, it will always be green. When you text another iPhone user, it will be blue if both phones have iMessage turned on and working.

What is RCS — the upgrade to SMS

~29s

RCS (Rich Communication Services) is a newer texting standard that brings modern features to non-Apple messaging. Android phones have supported RCS for years, and in 2024 Apple added RCS support to iPhone. When both an iPhone and an Android phone support RCS, the iPhone shows the conversation in a special blue-green style bubble (different from either classic blue or green) with features like read receipts, typing indicators, and better photo sharing. RCS is now supported between iPhones and most new Android phones on major US carriers.

What to do when texts are not going through

~32s

If messages are not sending (spinning circle, not delivered): first check if you have a signal and data connection. If the blue bubble turns green, iMessage fell back to SMS — that is normal on poor connections. If SMS is also failing, check if Do Not Disturb is blocking texts (SettingsFocusDo Not Disturb). If someone says they are not getting your texts, try sending from a different app (WhatsApp, Facebook Messenger) to check whether the issue is the number or the texting system. Restarting your phone fixes most temporary texting issues.

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If you have an iPhone, you have probably noticed that some text conversations have blue bubbles and some have green bubbles. This difference is not cosmetic — it tells you which messaging system is carrying your messages, and each system works differently in terms of cost, features, and what happens when things go wrong.

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