Bought my Kindle via amazon.com with the 3g, so I could browse a bit when abroad. As I now see I cannot even browse with 3g in my own country, the Netherlands (except for " shop in Kindle Store') , so I don't have great hopes for my travels in the future.
Also have a Borderlinx USadress and did an experiment: changed my country on ' manage my Kindle" and sent my content to my Kindle.
Outcome experiment: free 3G-browsing and free delivery of free books via Whispernet. But next day I got an email from Amazon, asking to prove my US-residence.
As it was an experiment, I changed my adress back. I now know my Kindle is able to do everything Amazon promised.
Edit: can somebody make sense of that?