The phone is a stock HTC One X.
The settings menu does not include a checkbox to enable/disable CB messages. They just keep popping up.
Update: Halfer already gave the link to the wikipedia article about CB, which should explain it in more detail than I ever can. What it means to me is that I get location information as I move around in town.
The screenshot here shows the checkbox for this feature on what I believe is Gingerbread.
Update 2: And this is the extremely boring message. This particular one just shows the carrier name, so it's even more useless and annoying than if it were showing location information.