It will only work on phones where the firmware shows USA. Changing your Region in the OS won't fool Microsoft's Servers. You must remember that this is a BETA software. It's NOT really ready for world-wide release. Look at it this way; we Americans are playing the "software guinea pigs" for the rest of the world. We will be working out all the bugs and glitches (and bearing all the frustrations) so that by the time you get it, it will be flawless (free of headaches) for you and the rest of the world. Microsoft has stated that this process won?t take very long. I don?t know how true it is, but I?ve read online that this should be released to Europe and China by the end of 2014 calendar year.