Infographic of countries with factory-unlocked iPhones and their prices: http://www.cutviews.com/wp-content/uploads/2010/08/02081001.png http://www.cutviews.com

Infographic of countries with factory-unlocked iPhones and their prices: http://www.cutviews.com/wp-content/uploads/2010/08/02081001.png http://www.cutviews.com/wp-content/uploads/2010/08/02081001.... Cheapest: #1 Hong Kong #2 Singapore #3 Canada #4 Switzerland Looks like the all the iPhones have the same radios. So, if an unlocked iPhone doesn't work on 3G with your current carrier (i.e. T-Mobile in the US), then you won't be able to find an iPhone anywhere that does. From the Apple site (I verified with the top 4 cheapest countries): * 3G Support: UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz) * 2G Support: GSM/EDGE (850, 900, 1800, 1900 MHz)