3G is a mobile-phone network capable of respectable data-transfer rates. Coverage throughout Europe is generally very good, but will obviously vary a little from network to network. More here -
http://en.wikipedia.org/wiki/3G_network
I don't have a Kindle or know anyone who does, so the following is based on what I've read:-
Kindle 2 'International' edition restricts 3G access to the Kindle bookstore outside the US - it does not include 'free' web access in the UK due to data roaming charges incurred by the phone networks here.
http://en.wikipedia.org/wiki/Amazon_...tional_version
http://www.wired.co.uk/news/archive/...owser?page=all
BTW, it helps if you put your location in your user profile - then we'd know if you lived in the UK, or were just planning a visit here
HTH, Pete.