Network unlock my iphone to use in england with vodafone?

I have an iphone 4 that i want to bring with me this summer to england. Does anyone know how i can unlock it to be able to use it with vodafone?

You can try calling your current carrier but they might charge a fee. You can also use this generator

http://networkunlock.org/iphone4/

i used it to unlock my phone from at&t. You have to do a survey to be able to download it but its well worth it and better than paying 20$

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