Cannot sign up for AT&T data plan on iPad 2 3G

I just got a new iPad 2 64GB WiFi + 3G model with the special pricing promotion and had to also purchase a data plan. When I tried to sign up for an AT&T data plan and tapped setting > Cellular Data > View Account, I got the error message "Your account type does not support the view account feature (H5006)."How to fix the AT&T issue with iPadThis probably means you are on a postpaid plan. You