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by kbf 941 days ago
Green means cellular, blue means internet. This same color distinction is used in other places in the UI, such as control center and settings.
2 comments
snowwrestler 941 days ago
Nope, it means SMS vs iMessage specifically.

> If you see a green message bubble instead of a blue one, then that message was sent using MMS/SMS instead of iMessage.

https://support.apple.com/en-us/105087

> iMessages are texts, photos, or videos that you send to another iPhone, iPad, iPod touch, or Mac over Wi-Fi or cellular-data networks. These messages are always encrypted and appear in blue text bubbles.

https://support.apple.com/en-us/HT207006

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mappu 941 days ago
MMS is email-style MIME messages retrieved over HTTP on a data connection. Push notifications for MMS are delivered as a special SMS, but otherwise it's far far closer to internet than cellular, and it's green.
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