as stated the 3G allows you to shop and download wirelessly on the fly without having to connect to wi fi. 3G is an automatic connection where ever At&t 3G is within range, which is pretty much anywhere, though I sure their are some area's that are not covered, but for the most part most areas are covered.
as far as the internet on the nook? I find using a websites mobile ip address to work very well. Normal websites are a little frustrating.
I do like ESPN mobile on the nook. But mostly I use it to connect to wi fi hot spots that require some form of a sign in.
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