Click a scenario below to see what happens behind the scenes
Universal — every phone supports it. Works with just a cellular signal, no data needed. Reliable fallback when nothing else works.
160 character limit per segment. No photos or video. No read receipts. No encryption. Being phased out by RCS.
Cellular signal only. Does NOT use WiFi or mobile data. Works even when data is turned off.
Photos, videos, GIFs, audio clips. Cross-platform (Apple to Android). Also handles group texts between mixed devices.
Compresses photos and video heavily — quality degrades badly. File size limits (usually under 1MB). Requires mobile data to be ON. Being replaced by RCS.
Mobile data required. WiFi alone usually does not work for MMS. This is why your phone sometimes asks you to enable mobile data to receive a picture.
High-res photos and video, reactions, read receipts, typing indicators, Tapbacks, large file sharing, end-to-end encryption. Works on WiFi with no SIM card.
Apple devices only. Falls back to SMS/MMS when sending to Android — losing all rich features and encryption. Green bubbles = downgraded experience.
WiFi OR cellular data. Does not use the SMS voice channel at all. Works internationally over WiFi with no local SIM.
High-res photos and video, read receipts, typing indicators, reactions, large group chats, location sharing. Much better than MMS in every way.
Apple added RCS in iOS 18 (Sept 2024). For the first time, iPhone and Android messaging gets rich features without needing a third-party app like WhatsApp.
WiFi OR cellular data. Falls back to SMS if neither device supports RCS. End-to-end encryption varies by carrier and is still being rolled out.
On iPhone: Blue bubble = iMessage (Apple only). Green bubble = SMS, MMS, or RCS going to Android. You cannot choose — the phone decides automatically based on what the recipient supports.
With iOS 18 and a modern Android, cross-platform messaging now gets read receipts, typing indicators, and high-quality media — no third-party app needed.
Add one Android to an iMessage group and the whole conversation drops to MMS or RCS. Features like reactions and read receipts may break or display differently across devices.
RCS supports true group chats with rich features cross-platform. As RCS adoption grows, mixed groups will work much better than they do today with MMS.
Apps like WhatsApp, Signal, or Telegram avoid this problem entirely — they use internet only, work on all platforms, and support full rich features regardless of device mix.
Many carriers support WiFi Calling — your phone makes calls and sends SMS over your WiFi connection instead of a cell tower. Useful in areas with poor signal but good WiFi.
Your phone prefers WiFi for iMessage and RCS. If WiFi drops mid-message, it seamlessly switches to cellular data. You usually will not notice the handoff.
Plain SMS travels on the carrier control channel — completely separate from internet data. With data turned OFF and no WiFi, SMS still works on any cell signal.
Still works everywhere but being actively replaced by RCS. No photos, no encryption, 160-character limit. Carriers are moving away from it for rich messaging, though it remains the universal fallback of last resort.
The way phones have sent photos since the early 2000s. Heavy compression, file size limits, requires mobile data. RCS is designed to fully replace it. Still used today for cross-platform media on older devices.
Best experience for Apple-to-Apple. Not going anywhere, but Apple added RCS support alongside it in iOS 18 for cross-platform use. Still the default for blue-bubble conversations between Apple devices.
Backed by Google, all major carriers, and now Apple (iOS 18, Sept 2024). Brings iMessage-like features to all phones regardless of brand. Expected to become the universal standard over the next few years.
Allows calls and texts over WiFi instead of a cell tower. Widely supported now across major carriers. Helps in buildings with poor cell signal. Coverage and reliability continue to expand.
Use internet data only. End-to-end encrypted. Work cross-platform on any device. Popular globally. Will coexist with RCS rather than be replaced — especially for users who prioritize privacy or international messaging.