RCS vs SMS: Why Some Android Texts Look Different

SMS is the decades-old plain-text standard that works on any phone; RCS (Rich Communication Services) is its modern replacement, and the reason some texts show typing dots, read receipts, and sharp photos while others don't. On Android, Google Messages uses RCS when it can and quietly falls back to SMS when it can't.

What SMS (and MMS) can do

SMS carries short plain-text messages over the mobile network, and MMS adds pictures and group threads. It is universal and needs no internet, but it is basic: no typing indicators, no read receipts, tight length limits, and media that arrives shrunken and blurry. It is the lowest common denominator that every phone understands.

What RCS adds

• Typing indicators and read receipts, the way a chat app shows them.
• High-resolution photos and video instead of compressed MMS attachments.
• Bigger group chats with names and reactions.
• End-to-end encryption in Google Messages when both people have RCS on.
• It runs over the internet, so it needs Wi-Fi or data, and drops back to SMS when there is neither.

Why some Android texts look richer than others

Whether a thread gets the rich features depends on both people. If both are on RCS, the conversation shows typing dots and read receipts and sends crisp media. If one side is on plain SMS — an older phone, RCS switched off, a carrier that doesn't support it — the whole thread falls back to the basic experience. Same app, different capabilities.

RCS and the iPhone

For years, iPhone-to-Android meant SMS, which is a big part of why those cross-platform texts are green and feature-poor. As of iOS 18 the iPhone supports RCS too, so an iPhone-to-Android thread can now carry typing indicators, read receipts, and better media — though on the iPhone the bubbles stay green.

Showing it in a screenshot

If you are making a mockup and want it to reflect a modern Google Messages thread — filled bubbles, a delivery label, a typing indicator — the Android Text Message Generator renders the Google Messages screen around a conversation you write, at real Pixel and Galaxy resolutions.