Worked like a dream. Thank you so much. I was so frustrated with this Smart Limits thing. They really need to do a better job of placing this somewhere where it can be easily found. Their instructions on how to get to it are COMPLETELY WRONG.
Thank you for posting this. And no thanks to AT&T for having a broken website for what, weeks? I had been trying to manage Smart Limits for a couple of weeks before I gave up, removed the service from the phone, then re-added it. I could edit the settings that way, but it was a one-time only solution.