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Help what wont work in US?

This is dependent upon your carrier and their roaming agreements in the US.

GSM/Edge will work with AT&T or T-Mobile

3G will only work with T-Mobile

Your best bet would likely be to get a flexpay plan through T-Mobile so you can have full 3G access w/out excessive data roaming charges from your carrier and just cancel it when you are leaving.

Though, that does depend upon where you are going to be in the states, T-Mobiles 3G network here is still quite young. If you are going to be in a major city, it will be fine.
 
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From what I have gathered the devices being sold in Germany and France at least are quad-band GSM/Edge and tri-band 3G, including the needed 1700 AWS band that T-Mobile uses here in the states. I heard from a user on another forum who imported one from Germany that he picked up 3G on T-Mobile.

Expansys lists a 'UK version' and it does *not* list the necessary band in it's specs. Also, a version sporting AT&T compatible 3G passed thru the FCC last week, but it was gathered from accompanying documentation that it is headed for Latin / South America and there obviously was not any sort of release schedule included.

I do not think any info has surfaced on the version going on sale tomorrow in Taiwan, but I would guess it is the same as what is currently out- only way to know is wait and see.
 
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The hardware supports the band and rumours/inside info suggest that only the radio firmware could/would dictate the frequency band restrictions. This is great news because it means the antenna's are quad band :) Its unlikely that, if they are shipping european phones enabled on the 1700mhz T-mobile band, that they would later disable this band for a version in another region. Obviously the US band should have 1700mhz enabled.

Incidentally i thought AT&T use a subsection of the GSM bands for UMTS? They should work too, but i think only major cities are covered
 
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