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If the iPhone is factory unlocked,yes u can use it

If not,nope

U have to jailbrake it and unlock it.

Still no unlock for the 4-th iPhone

Maybe the next week it's gonna to be a release

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Q: If you buy an iphone 4 from the U.S and bring it to Australia wil it work. do i just have to unlock it. can you do that. what sim card does it work with?
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