Unless I am missing something or just plain stupid, i don't see anywhere in iOS 8.1 where one can cut off the Cellar Data...and it just reminds me all the time to sign up for a plan, etc. oh, it on the annoying give me the option to cancel sign up now or later. I always choose "later" so it always come back later...when I am in a non-WiFi area. I had the iPad Air 1 and there was a place to disable cellar data...but that radio button is gone from the latest version of Pad Air 2. It seems as if Apples is trying to force me to use cellular data! finally, I bought the cellar unit because it has a built in GPS and some apps require it and the maps will work without the cellar data or Wifi. Example...in a WiFi environment, download the map directions and press Start, then even out of WIFI OR CELLAR, it will give step by step directions...the only drawback is that it will not recalculate without Wifi or Call...but it does show where you are on the maps so you just have to navigate back to the chosen route. For info, here are screen shots of the iOS 8.1 with the newest version of the iPad.