Not sure how to get my AT&T iPad cellular service going. It won't let me click in set up my new account in the cellular data section df settings.
I would recommend force closing all open apps on the iPad, then restarting the device. If necessary, it may be helpful to reset your iPad.
iOS: Understanding multitasking
iPhone, iPad, iPod touch: Turning off and on (restarting) and resetting
Retrieving data ...