Found a potential fix ~ have a 4S, and when this annoying thing kept saying I had an unread message, I pulled from the top of screen (notification center) and it ahowed my calendar events, emails AND a text message that looked as though it had not been read. Even though I did read it, I went to that particular text exchange with the sender & looked at it, exited from the text conversation and bam ~ it was gone. The notification center essentially gave me the clues needed to find what message was causing the unread error.
Hope this possibly helps others.
Hope this possibly helps others.
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