I travel regulalry between UK USA and Japan. I would love to have an andriod that worked in all. Can I use a "Pay As You Go" SIM in all three places? I think I am best to buy 1 SIM for UK and 1 SIM for the USA. The best of the two would also work in Japan - I would like to use a local Japanese SIM card but unfortunately I know that Japan doesn't sell the western type of SIM cards. In summary, if you travelled a lot to these places, what would you do? Thanks a lot for your advice.