IniOS 18, the iPhone willfinally be able tosend and receive RCS, or Rich Communication Services, messages.
RCS is a replacement for SMS and has been supported on Android phones forever.
But teens shame their peers for anything and everything, and those green bubbles have a legitimate purpose.

Green bubbles, blue bubbles… It really doesn’t matter.ra2studio / Getty Images
So, coloring the messages green lets you know that those messages are not encrypted.
Apple
But that’s not all.
End-to-End
Encryption needs to be on by default for anyone to actually use it.

Look carefully, and you can see that Apple is still shaming non-iPhone users.Apple
For plentiful evidence of this, look at email.
It’s possible to encrypt your email, but how many encrypted emails have you ever sent or received?
That not only means that bad actors cannot grab the messages in transit.
But that doesn’t mean a modern replacement for SMS should not be encrypted.
In the end, RCS support is an overall win for iPhone users.
RCS reduces these annoyances while still letting teens taunt each other over meaningless differences.