Using a UK iPhone on T-Mo USA.

[Sherminator]

As I understand it, a US iPhone won't get 3G on T-Mobile USA as the HSPDA / UMTS that T-Mobile uses is on a different frequency (1700/2100MHz) than the one that AT&T uses (1900MHz).

The major players in the UK that carry the iPhone all use 2100Mhz for their 3G network.

Is there anything else that would prevent a UK iPhone (factory or ultrasn0w unlocked) from getting 3G on T-Mobile in the USA?

[Cer0]

All iPhones are the same, minus the Verizon one. Meaning they all use the same frequency. So the UK iPhone is the same as the ATT phone. But T-Mobile US network uses a different frequency than T-Mobile UK's network uses.

[Sherminator]

Are you saying that despite T-Mo USA also having 2100MHz, they utilize the 1700MHz wavelength primarily?

On another note, will the AT&T iPhone work with the 2100MHz 3G wavelength used in the UK?

[Cer0]

T-Mobile USA uses the 1700/2100 MHz AWS Band for its 3G network

AWS band is only used in the United States and Canada.

Source: T-Mobile - Wikipedia, the free encyclopedia and Advanced Wireless Services - Wikipedia, the free encyclopedia

[Orby]

Are you saying that despite T-Mo USA also having 2100MHz, they utilize the 1700MHz wavelength primarily?

On another note, will the AT&T iPhone work with the 2100MHz 3G wavelength used in the UK?

Yes and yes.