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Audible.com

The best way to listen to Audiobooks on your iPhone

Because I want to feed my brain with great content and audio is one of the best way for me. :) I do a lot of passive listening too during my commute and while being at home. If you want to give it a try, they give a 1 month free trial where you can get 1 book free and you may cancel if you don't like the service. PS: Search online and you may get some offers where they give 2 books free for the first month (only for new subscribers).
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