can a USA iPhone 3G work in Asia / China / HK?

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it seems that USA iPhone 3G is using 3G instead of 2G. In Asia / China / Hong Kong, most SIM card that is sold at Seven Eleven is for 2G.

In those area, if you get a tri-band 2G cell phone ( GSM 900/1800/1900 ), then you can use the phone in Asia and USA.

so I wonder, if the iPhone 3G is jailbroken and unlocked, can it be used in Asia / China / Hong Kong?
 
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Yes you should be able to use the iPhone if it is unlocked in Asia/China/Hong Kong.

The iPhone uses the following GSM frequencies: GSM/EDGE (850, 900, 1800, 1900 MHz)
 
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China is getting its own iPhone soon.
 

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