Factory Unlocked iPhone: Please explain?

How exactly do I determine whether the iPhone 4s I want to buy is indeed factory or genuinely unlocked, and will not bring problems when I move to another country for example?

No real way to tell… But if it is from apple or some other major retailer it should be fine… Make sure you are not buying from a 3rd party retailer.

You can't tell, just buy it from apple.

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