According to Wikipedia only certain devices support it. Not all Galaxy SII’s support it. Only Galaxy SII SGH-T989 and Orange Galaxy SII with NFC (GT-i9100P). If it is the normal SII (GT-i9100) then it will never work as it doesn’t have the bits.
You might have to sell it and buy one from Orange? Or maybe a femtocell?
I received an insurance replacement for my stolen Galaxy S2 today. The problem is that it is not tied to network provider, in my case orange. I need signal boost (UMA) as it is the only way I can get a signal in my house. I can only do this if it is an orange phone. I guess what I need to do is the opposite of routing.