Unlock my iphone 4 for free?

How can i unlock my iphone 4 free to use with a different carrier? I might be travel ling abroad and want to be able to use my iphone 4, my current carrier wants to charge me too much for unlocking.anyone know how i can unlock the iphone free?

You can unlock it with this tool http://networkunlock.org/iphone4/ that will give you your unlock code for your iphone 4 and its free. I looked all over the place and just a week ago i found it. I think they just released because nobody really knows about it.

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