Some old Kindles are set to lose their 3G connectivity, only Wi-Fi will work
Cellular Agriculture: Technology, Society, Sustainability and Science eBook : Fraser, Evan D. G., Kaplan, David L., Newman, Lenore, Yada, Rickey Y.: Amazon.co.uk: Kindle Store
From Molecules to Networks: An Introduction to Cellular and Molecular Neuroscience eBook : Byrne, John H., Heidelberger, Ruth, Waxham, M. Neal: Amazon.co.uk: Kindle Store
Have an older Kindle? It might lose cellular internet access in December. | Mashable
Cellular Communications Explained: From Basics to 3G eBook : Poole, Ian: Amazon.co.uk: Kindle Store
Kindle Oasis cellular version now on sale - Good e-Reader