3G question

[ghosthunter]

to put the question in another way: say i have a unit that can do UMTS 850, can i use it to connect *via 3G* in the US? Or do i need UMTS 1900?

Based on what i've seen, most 3G phones usually do UMTS850/1900(US versions) or 2100( most parts of the world).

If your phone was 850 and 2100 ... then your phone will use 850 to connect if you are in the USA. Of course, that depends if there is a service provider using 850 in the area you are visiting in the USA.