I downloaded a number of free books from the Play Store and started reading one of them (I am up to chapter 4). Today I went to access the book and I got an option to "download now" and data charges may apply. I tried to re-download it from Play Store and the only option I get is "Open". I checked the other books and the same thing is occurs. Any ideas why this is happening and how to fix it? I do not think I should have to eat into my data plan to read a book I already downloaded.