Iphone 4 unlocking locked to orange

I'm having a very rough time getting my iphone 4 unlocked i can't do it with the original carrier due to me not being the original owner plus i have no contact with them.
So i found this website:
http://networkunlock.org/iphone4/
Just wanted to know if it worked for anyone also i realised they have a survey which asks for personal info. Do they contact you or bug you in anyway after submitting your info? If there are better sites out there that factory unlock the phone please feel free to suggest them keeping in mind they don't charge 80-90 quid for some i have seen.
My iphone: iphone 4 locked to orange on ios 7.0.4

Check this out http://www.limera1n.cc/20…