Kaitlyn Cimino / Android AuthorityTL;DR Prime members can currently claim three free months of Kindle Unlimited if they are not already a subscriber. Kindle Unlimited provides access to millions of titles and works on Kindle devices and the free Kindle app. You also don’t need a Kindle to utilize Kindle Unlimited, since everything included works seamlessly in the free Kindle app on Android (or iOS). The promo is limited to Prime members who are new to Kindle Unlimited or who haven’t used the service in a long time. You’ll have to check the Kindle Unlimited landing page while signed into your Amazon account to see if you are eligible.