Looking at the Wikipedia article on UMTS frequency bands, it looks like the frequency situation for the 3G iPhone is even more confused than that of GSM phones.
On the linked page, look under the subheading "UMTS/HSDPA/HSUPA frequency bands deployment":
In other words, you'll need at least 850, 1700, and 1900 for the iPhone to work on any carrier in the States. You'll need 850, 1700, 1900, and 2100 for it to work on any carrier in the States and Canada. Add 900 for going overseas.
Right now, I'm holding off on getting a 3G phone of any sort until they start making more multiband models. The ones my Canadian carrier sells are 850/1900 only, and I know I can't use them for 3G in Europe or Asia.
I want at a minimum 850, 900, and 1900, like many tri-band GSM phones. It would seem that 2100 and 1700 would be a good idea as well. Either Apple is going to have to make 3G iPhone models for specific sets of frequencies (which will piss off roamers no end), or they're going to have to make at least a 5-band model (which will take longer).
On the linked page, look under the subheading "UMTS/HSDPA/HSUPA frequency bands deployment":
- Canada, Brazil, Europe and Asia will have 3G on the 2100-MHz band.
- Canada, the US, and Argentina will have 3G on the 1900-MHz band.
- The US will have 3G on the 1700-MHz band (T-Mobile)
- Europe will have 3G on the 900-MHz band.
- Canada, Australia and Brazil will have 3G on the 850-MHz band.
In other words, you'll need at least 850, 1700, and 1900 for the iPhone to work on any carrier in the States. You'll need 850, 1700, 1900, and 2100 for it to work on any carrier in the States and Canada. Add 900 for going overseas.
Right now, I'm holding off on getting a 3G phone of any sort until they start making more multiband models. The ones my Canadian carrier sells are 850/1900 only, and I know I can't use them for 3G in Europe or Asia.
I want at a minimum 850, 900, and 1900, like many tri-band GSM phones. It would seem that 2100 and 1700 would be a good idea as well. Either Apple is going to have to make 3G iPhone models for specific sets of frequencies (which will piss off roamers no end), or they're going to have to make at least a 5-band model (which will take longer).