confusion about unlocked iPhone 5 price

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Black wrote:
Why does it need to be unlocked?

you keep asking the same question. I keep giving you the same answer.

I want to use it prepaid, on different carriers, I want to use it in Europe, I don't want to depend on jailbreaks and I want to have full warranty. and were I could be able to get a contract free iPhone 5 that is locked anyway? the only way to get a contract free iPhone is to buy unlocked.