As predicted, Apple has started selling unlocked (GSM) iPhone 4 devices in the U.S. early this morning.
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If you don't want a multiyear service contract or if you prefer to use a local carrier when traveling abroad, the unlocked iPhone 4 is the best choice. It arrives without a micro-SIM card, so you'll need an active micro-SIM card from any supported GSM carrier worldwide.
Pricing starts at $649 for a 16GB model and $749 for 32GB model. Both White and Black models are offered. "
The main advantage of buying an unlocked iPhone is for international travel, as the device is not dependent on any particular carrier. The U.S. only has one network (AT&T) which fully supports all the features of an unlocked GSM iPhone. T-Mobile is compatible with voice calls, but the 3G network is not compatible. The higher price of the iPhones reflect no-contract pricing as well as the unlocked status of the device. While the iPhone 4 had been sold unlocked in other countries, this is the first time Apple has offered them in the U.S.
-MacRumors
