Kindle Unlimited is a $11.99 monthly subscription service offering access to over four million digital books, audiobooks, comics, and magazines. Users can borrow up to 20 titles at a time with no due ...

"I can't read e-books because I don't have a Kindle," people tell me. But they can use the free Kindle app on their phones and tablets. Once you've installed the app on your mobile device, you're ...