Kindle books are only readable on a Kindle. There is no legal way to convert them. You can buy books from other places, like Fictionwise.com and Baen Books (www.webscription.net) in an open Mobipocket format that is usable on a lot of smartphones. Don't get the Secure Mobipocket ones unless you're sure your phone can read them; they have DRM specific to a device.
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Kindle books are only readable on a Kindle. There is no legal way to convert them. You can buy books from other places, like Fictionwise.com and Baen Books (www.webscription.net) in an open Mobipocket format that is usable on a lot of smartphones. Don't get the Secure Mobipocket ones unless you're sure your phone can read them; they have DRM specific to a device.