For three days now, I have had a pop-up on my iPad2 saying "Carrier Settings Update" and two options: Not Now, and Update. Pressing either button does nothing!!! Nothing happens, it doesn't go away, and I can't do anything else. I can't even turn it off because "slide to unlock" is disabled because of the (unresponsive) pop-up. I brought it in to work to see if it would stop looking for whatever this carrier update is, but same thing. Please help! It's completely useless until I can get this resolved.