Honestly I don't know.
From what I understand the Kindles sold in the UK have a Vodafone SIM chip rather than an AT&T but coverage on them is supposed to be equal.
That is of course assuming you bought the 3G version and not just WiFi. From what I understand the WiFi models are identical.
I do know of at least one UK user here who has been able to switch back and forth from Amazon.co.uk and Amazon.com, but I don't know which model of Kindle she is using either.
I'll keep my fingers crossed for you though.
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