iPhone still is restricted only to US. Since Apple has tie-up only with the American AT&T company,with this guy's unlocked iPhone, it could be used with any other service providers. This means, any network provider can fit inside this much hyped wireless device.

Related reads:
http://www.meroguff.com/2007/02/war-of-mobile-phones.html
http://www.meroguff.com/2007/07/iphone-craze-growing-all-over-world.html
http://hosted.ap.org/dynamic/stories/I/IPHONE_UNLOCKED?SITE=WIRE&SECTION=HOME&TEMPLATE=DEFAULT
Comments
But I cant find.From yours I got unlocked apple iphone.Thank U.