Quote:
Originally Posted by Catlady
Here's the scenario I'm asking about. I don't have a Kindle. I'd be using an app on my phone. Wi-fi drains the battery, so I mostly turn it off. Say I read the book offline, then flip back to the cover. The next time I turn wi-fi on and return the book, how can Amazon know if I read it or not?
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Because the app stores the furthest page read in each book, and sends that information back to Amazon's servers when you sync.