Understanding Galaxy Message Colors: Functions and Transmission Differences
When using the default messaging app on Galaxy smartphones, you may notice messages displayed in blue, green, or gray in your chat threads. These colors are not just aesthetic—they indicate the message transmission method and available features. In this article, we explain the differences between message colors and their functions, along with useful tips on how to manage them.
Blue Messages: RCS Chat (Data-Based Messaging)
Messages displayed in blue are sent via RCS (Rich Communication Services). This next-generation messaging protocol is designed to replace traditional SMS, offering features similar to popular messaging apps.
Key Features:
- Transmission Method: Wi-Fi or mobile data
- Requirements: Both sender and receiver must have Android devices with RCS enabled
- Functions:
- See when the recipient is typing
- Read receipts available
- Send high-resolution images and large files
- Supports group chats
- Cost: Free (data usage applies)
When It Applies:
- Both users have Galaxy devices with RCS enabled
- Stable data connection (Wi-Fi/LTE/5G)
Green Messages: SMS/MMS (Carrier-Based Messaging)
Messages shown in green are sent via SMS or MMS, the traditional carrier-based text messaging system.
Key Features:
- Transmission Method: Mobile carrier network (SKT, KT, LG U+)
- Requirements:
- Recipient uses an iPhone or a non-RCS device
- Data/Wi-Fi turned off for either party
- RCS disabled
- Functions:
- Cannot see typing status or read receipts
- File size limited (MMS usually under 3MB)
- Cost: Standard text messaging fees apply (depending on your plan)
When It Applies:
- Messaging iPhone users
- Data/Wi-Fi turned off
- Roaming where RCS is unsupported
Gray Messages: Received Messages
Gray indicates a received message and does not depend on the transmission method. Whether the incoming message is RCS or SMS/MMS, it appears in gray.
Summary of Message Colors
| Message Color | Transmission Method | Key Features | Cost | When It Applies |
|---|---|---|---|---|
| Blue | RCS (data-based) | Typing & read receipts, high-res images & large files, group chat | Free (data usage only) | Both RCS enabled + active data connection |
| Green | SMS/MMS (carrier-based) | No typing/read info, size limits | May incur charges | RCS not supported, data off, iPhone users |
| Gray | Received message | Visual indicator of incoming messages | None | All messages received |
Notes
- Enable RCS: Messaging app → top-right menu (︙) → Settings → Chat features → “Enable”
- iPhone Conversations: Always sent as green messages
- Blue turns green: Happens when data connection is lost or RCS server is temporarily unavailable
Conclusion
Galaxy message colors reflect transmission method and features rather than design choices.
- Blue: RCS chat with messenger-level convenience, free of SMS fees
- Green: SMS/MMS with limitations, may incur charges
- Gray: Indicates a received message
Understanding these differences helps avoid unnecessary fees and use messaging features efficiently.
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