I think it's strange that Apple hasn't released the iPhone to more carriers in the US. In Europe it's available for all carriers.

Apple Informatory (@informatory):
2010-10-07 12:08
Report: New iPhone allows more carriers - Indianapolis Star http://goo.gl/fb/Sg6Ql http://j.mp/AllApple
https://twitter.com/informatory/status/26635586627

A new report says Apple Inc. is getting ready to manufacture a new iPhone based on technology that would allow the phones to be used by more carriers, including Verizon Wireless.

Find more info about a coming CDMA iPhone here:

http://s.svrt.se/CDMA_iPhone