IPhone locked to 3 network

I want to buy an iPhone and someone is selling an iPhone 5 but it's locked to the 3 network. I already have a rolling contract on Virgin Media at a good price though. Will I be able to put my current micro sim into this new phone? Is it possible to unlock it?

It will be locked. However you can find some sites that unlock it for free, or if they charge its like £15. Try unlock-iphone (.info)

Just take it into a store where they can unlock it for you. Then you should be able to use/have any network on it.

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