3g bands

Hi, I’m from Argentina and in my country the frequencies used to operate the 3g are the 850mhz and 1900mhz., I understood that if you bring the 850mhz and 1900mhz frequencies for 3G but I’m a little confused because I set in this web http://www.willmyphonework.net/
and he says it does not support 3g and for me this web is wrong and I think it works.
Will it work? Thanks

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