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
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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