Okay, we have talked about the iPhone 3G unlocking a few months ago. Now is the time to learn exactly how to Get it to work. Using this mthod you will be able to unlock your iPhone 3G to work on any network carrier in the world. You will be using Sim Proxy to be able to unlock the Apple cellphone. There are many Proxy SIMs available in the market like the ‘Proxy-Sim’, ‘Any-Network Sim’, TurboSIM’, ‘xSIM’ including many others that can do the job for you.
In this Particular tutorial Olly Farshi from the Apple Blog explains how exactly he got his iPhone 3G working on his unsupported Finnish GSM SIM card. You will need to peel out the back of your Mobile SIM to make the SIM + Proxy-SIM completely fit in the SIM tray of your iPhone 3G. Best of luck unlocking.