A couple of years ago, Amazon removed the ability to purchase e-books with their flagship Kindle for Android from the Google Play Store. Google implemented a policy that all in-app purchases had to be made using their billing system. Instead of paying Google 30% of each e-book sold, Amazon removed the ability to buy e-books or audiobooks. //

Amazon operates their own Android App store. You can install the Amazon App Store and download the Kindle app if you have a smartphone or tablet. All of the audiobooks and e-books that are available in the store can be purchased. This is because Amazon uses their billing system, the same one that their Kindle e-readers use.