How do I shut off my cellular data for ibooks?

cya3679 wrote:

I tried everything from shutting it off from my cellular data setting page to restarting my iphone 5c. I need help.

I have the same problem with my 5s iOS 8.3. I turn off cellular, both in Settings (iBooks) and then again in Cellular, and it turns itself back on, in both places, as soon as I close settings.