How to unlock an iPhone 3GS? - 2

I want to get a plan from Walmart that's $45 a month that's unlimited everything but they said I need to unlock my iphone before they can do anything. Can I just restore the factory settings? If you know how to unlock it or any other way that will work so I can get a plan from them please respond.

Go to the Apple Store: Wallmart: Target (ect) and they will unlock it for you for for $10

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