I recently had to swap out my sim at a Verizon store on my iPad 3. Now when I attempt to "view account" (from settings -> cellular data), instead of being prompted for my e-mail address and password, I am greeted with the message "Your device is already active on a subscription that cannot be managed on this device. Please call customer service at 1-800-786-8419 if you have any questions." I tried calling support and they don't seem to understand what the issue is. I normally just use the pre-paid option and turn the service on as I need it.