How do you unlock an iPhone 3G which is on Vodafone?

Just bough an iPhone on Vodafone but need to to work on '3' how do you unlock it?

Thanks

Hi you can easily unlock your iphone3g by using remote unlock method. If you need remote unlocking service you can visit this site Simpleunlocking.com here you can get the service and unlock your iphone3g easily. Using the free mobile unlocking instructions from this site Mobileunlockguide.com