How to unlock my iphone 4 to any sim?

I bought a iphone 4 on ebay and its locked to orange, and i found shops that are asking fr £80 to unlock it, and i'm not willing to pay that, i've rang orange but they won't unlock it unless its the offical buyer, they said if i'm on orange p2g for 6months i can do it, but my contract is on 3 and i want to use my iphone on 4 but i don't know how to unlock it? Any suggestions?

Just follow the rules and regulations please?! Good mind?

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