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From the manual :
For Kindle models that include 3G, you can avoid 3G delivery fees for the personal document service by addressing the e-mail so that the second part of your Kindle e-mail address is @free.kindle.com. The document will be delivered to your Kindle when your Kindle is connected via Wi-Fi and it will also be e-mailed to your Amazon e-mail address.
So as far as I understand, the @free.kindle.com is delivered only when a WiFi connection is used.
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