The Bold 9000 has 3G bands 1,2,5,6 which are the same as Rogers and At&t 3G bands.
T-Mobile USA operates on 3G bands 1,4,8.
Therefore the Bold 9000 is not able to use T-Mobile USA's 3G frequencies.
However.... if you unlock your Bold 9000....you can use it on T-Mobile USA's network, but you will only be able to use their 2.5G EDGE frequencies.
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