As I known, nearly all of the tablet can download ebooks only by wifi connected.
For instance, I can read Google books purchased from Google Play Books on Nexus 7. And I can also read Kindle books on my Nexus 7, too. http://www.epubor.com/read-ebooks-on-nexus-7.html
Answers & Comments
Could you tell me the name of your tablet?
As I known, nearly all of the tablet can download ebooks only by wifi connected.
For instance, I can read Google books purchased from Google Play Books on Nexus 7. And I can also read Kindle books on my Nexus 7, too.
http://www.epubor.com/read-ebooks-on-nexus-7.html