The AT&T handsets are obviously locked to the carrier, and intended to be sold subsidized and with a new, two-year agreement. However, if marked “Device Only” on the checkout system, when activated they will apparently also be unlocked for use on any GSM carrier. Apple began selling unlocked iPhone 4 handsets in the US on June 14, with the 16GB model priced at $649 and the 32GB model at $749.
It’s not clear whether this is an indication that stock levels of the unlocked versions – which come in both black and white – are running low, or if it’s simply a useful tip for Apple retail employees. Once unlocked, the iPhone 4 can be used with T-Mobile USA SIM cards after they have been cut down to suit the microSIM slot; however, they’ll also be limited to EDGE data speeds, since T-Mobile USA’s 3G network uses different frequencies to AT&T’s. Nonetheless, it’s apparently still a compelling option: T-Mobile USA announced last week that it had 1m iPhones operating on its network.
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