that is not something I have seen. wonder if its something specific with your model and carrier's firmware.
In regards to adding/removing apps, did this show up just AFTER an app install/uninstall?
did you edit or alter your wallpaper? what happens if you change the background wallpaper? do those numbers go away or do they show up even if you change the wallpaper/background image?
EDIT: you know what should be there? your carriers name should be there!
have you played around with your phones internal programming at all? the "## codes" that one enters on the dial pad?