Green Texts
When you send a text to another iPhone user and your sent text messages turn GREEN what does this mean?
iPhone 12 Pro Max, iOS 14
Question marked as
It means he’s “disconnected” from Apple’s iMessage data network and that your phone is attempting to deliver the mesage via SMS text thru your mobile carrier.
See a bit more info in this article:
https://support.apple.com/en-au/HT207006