heres what i've gathered. The new iPhone is 3G. Some of the iPhones on Ebay, are not the newer generation. I'm sure you know all this, just wanted to clarify. I believe if you have an unlocked iPhone you can use it on any cell network, as long as it does GSM.
Which companies have GSM in the USA?
There are two main companies that offer GSM service in the USA. AT&T and Cingular are now merged into one company, and the second company is T-Mobile.
If your service is with, eg, Sprint, Nextel, Verizon, or just about any other US wireless company, then you do not have GSM service and your phone can't be unlocked.
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