How to unlock a iphone 4 from 3 network to any network?

I'm buying an iphone 4 of my friend and it is locked to 3 network. I have never been on this network but i went in store today and asked how i would go about unlocking it so i can use it with my giffgaff sim card and they told me to check there website. Now i have done that i see that i need a 3 sim card and a 3 account but can any one give me a step by step guid on how to unlock the phone?

I think you'll have to talk to the friend who gave it to you and ask them to unlock it. I doubt three will help you without you having an account with them.

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