How to unlock my chinese iphone 4s?

I have a Chinese version Iphone 4s which is exactly like those of real one. I have bought it in Papua New Guinea. I used it with digicel network. But now as I have come to India, I'm not able to use the phone with any other network sim cards. Do I need to factory unlock this phone though it is not the real Iphone? Do I have to pay for that too? Any idea?

Do you mean it is a clone iPhone? You can check some unlock service if they can unlock a clone iPhone. But if it is a real deal iPhone, you can unlock it here http://jailbreakhome.com/iphone-factory-unlock.