How to unlock an iPhone 4s I just bought from eBay on the O2 network?

How do I unlock an iPhone 4s I just bought from eBay on the O2 network?

Added (1). I want to unlock it so I can use it with the 3 Network

To unlock your iPhone 4s, use Remote unlocking method. You can get it from any of the online vendors like http://www.theunlockspot.com/apple-iphone-4s/rs16wp9/ to unlock it. After unlocking your iPhone 4s, you can use it with any other GSM carriers internationally.

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