Apple’s US online store today began accepting orders for the unlocked iPhone 4S, priced at $649/$749/$849 for the 16/32/64GB version, making good on its promise to provide the unlocked handset in November. The company advises:

The unlocked iPhone works only on supported GSM networks, such as AT&T in the U.S. When you travel internationally, you can also use a micro-SIM card from a local GSM carrier. The unlocked iPhone will not work with CDMA carriers such as Verizon Wireless or Sprint.

An unlocked iPhone 4S is of particular interest to those traveling abroad as they can just pop in a local carrier’s SIM card to avoid paying exorbitant roaming fees.

Meanwhile, carrier Sprint today begun SIM-locking all iPhone 4S devices purchased Friday, November 11, 2011 and onwards, SprintFeed noted. According to SprintFeed:

Starting tomorrow, all iPhone 4S devices will have the SIM locked. The locking occurs during the activation process and is invisible to the customer (no extra action is needed by customer or rep).

9to5Mac discovered mid-October that Apple Stores in the United States were selling contract-free iPhones. Any GSM phone that was sold off contract was unlocked and we’ve confirmed that they’ve stayed unlocked, even after the 5.0.1 update (below).

Users activate a contract-free iPhone 4S by simply plugging the device into iTunes, which produces the above prompt.

 

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