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I have an Australian (GSM) Hero. I've just moved to the USA and signed up for T-Mobile, but so far I'm only getting EDGE speeds.
As I understand it, T-Mobile uses the 2100MHz HSPA band, which my phone should support, so I should be getting 3G speeds, right?
T-mobile US uses the AWS 1700/2100mhz bands for 3G. Your phone needs to support both of these frequencies to work, not just the 2100 band. Very few phones not sold directly by T-mobile will support these 3G bands since they are very uncommon.
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As the others have said: no.
T-Mobile US' band is Band IV (list of bands: en.wikipedia.org/wiki/UMTS_frequency_bands) ... it is not a widely used band around the world, so you'd probably need a phone specifically made for T-Mobile's band. If you didn't sign a contract (and just did an Even More Plus plan or something), then maybe you'd want to look into selling your phone and buying an unlocked Nexus One. You should be able to buy other Android phones through T-mobile out-of-contract, but not unlocked.
T-Mobile US' band is Band IV (list of bands: en.wikipedia.org/wiki/UMTS_frequency_bands) ... it is not a widely used band around the world, so you'd probably need a phone specifically made for T-Mobile's band. If you didn't sign a contract (and just did an Even More Plus plan or something), then maybe you'd want to look into selling your phone and buying an unlocked Nexus One. You should be able to buy other Android phones through T-mobile out-of-contract, but not unlocked.
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T-Mobile uses the 1700 AWS band for downlink and 2100 for uplink, like jlarex said, you need both.
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