I used my US/T-mobile enabled Nexus One in the UK just a few weeks ago when traveling to EuroPython in Birmingham, UK. When I arrived in London's Paddington Sta

I used my US/T-mobile enabled Nexus One in the UK just a few weeks ago when traveling to EuroPython in Birmingham, UK. When I arrived in London's Paddington Station, I bought a pre-paid £20 Vodafone SIM chip (don't forget to ask for data access, too!) I was quite happy with the results. No problems whatsover. Android 2.2's wifi tethering worked very well -- I loved having 'net access when the rest of the conference wifi network was a tad flaky. The £20 lasted for a full week of several calls back to the states and tons of data usage. If you're local to the UK, I'm sure you can get a better deal on a SIM chip.