as far as I was aware the Nexus S doesnt have 4G...its rumoured t-mobile MAY release a 4G version but as yet nothing is concrete..
My roomate has the nexus s on t-mobile and he gets 4g which shows up as "H" instead of the 3g emblem, and its very quick, but he doesnt use it to tether very much so he doesnt have my same problem
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