I often get asked how i did it. I have a fully working iPhone which is working on Orange, i didn't sign up to an expensive O2 contract.

Its now very simple to unlock a new iPhone purchased from O2, Carphone Warehouse or Apple without contract. Just download the application called ZiPhone from the link below. 

  One you have installed ZiPhone simply attach your iPhone via USB.

Click on the Do it all button, then sit back for 5 - 10 minutes while the application unlocks and activates your new iPhone.