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To realize this idea, Apple is working with Gemalto (who recently sued Google and Android). With special ROM, data can be inserted into the SIM card that shows you how the iPhone 5 activation to all operators who want the buyer.
In this way then Apple will have control over all devices iPhone 5, similar to the BlackBerry that wearing certain pins, but in a broader sense. It also will cut iPhone 5 sales distribution because potential users could buy directly from Apple without going through mobile operators and SIM card replacement is not required if the user wants to switch operators.
Whether this concept Iphone 5 will actually be realized?