How do I make my messages blue again? I already have an iPhone but all of the sudden it changed to green.
My messages in my iPhone are green.
iPhone 13, iOS 15
That’s an indication that your phone is not connected to or not signed-in to your iCloud.
This might also be an indication of an issue w/ your carrier’s mobile DATA connection.
A bit more explanation is available here:
What is the difference between iMessage and SMS/MMS? - Apple Support