CNET. It's also worth noting that up until now, Apple and the carriers have played fast and loose with the definition of 4G. If you remember, AT&T iPhone 4S owners suddenly saw a 4G icon on their phones when they upgraded to iOS 5.1. That was because AT&T was calling its HSPA+ network 4G even though there was disagreement about whether the technology really qualified.
Will I be able to use the iPhone 5 overseas?Yes, though there are a couple of caveats. With the iPhone 5, Apple is doing away with the dual-mode GSM/CDMA support that we saw in all versions of the iPhone 4S. Instead, it's selling three distinct iPhone 5 versions: one CDMA-based model and two GSM-based models with slightly different LTE bands. Having separate versions is another factor that makes carrier interoperability difficult. On the other hand, losing the CDMA support on AT&T phones is irrelevant since AT&T customers have no use for it anyway... Read more