There are no hidden charges with 3G. It's completely free and you can it use to to surf the internet in addition to downloading books with Kindle's built-in browser.
The only charge ever is for emailing docs to your Kindle yourself. You can avoid this by only using the @free.kindle.com email address instead of your regular @kindle.com email address when you are connected to wifi.
You can also set the document charge limit to zero in the "Manage Your Kindle" section of your Amazon account. I attached a screen shot.
Additionally, there are no worries about anyone emailing your Kindle documents as you must enter approved email address to receive from. This is also located in the "Manage Your Kindle" section. Amazon makes it all very user friendly.
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