The "Carrier" part of the iPad only shows if your iPad is cellular-capable. It appears so that you can manage your cellular account (start/stop service, e-mail your carrier, add data. etc). It makes it so you don't have to use your computer (or call the carrier) in order to initialize a data plan to use the iPad's 3/4G.
Marilyn
P.S. Please don't make duplicate posts on the same issue. Not only do duplicates confuse the issue and make it hard to follow along, they are against the forum rules. Please keep any further questions or updates about this issue to this thread; do not start another. I have deleted the other thread you started. Thanks for your understanding.