How much does it cost to unlock iPhone 3g?

I was thinking about buying an I phone 3G on 02. How much would it cost to unlock it.

Do it yourself.very easy and free.

If you need to unlock your iPhone 3G safer and easier, You can get it unlocked through remote unlocking method. You can get this remote unlocking from http://www.wickedunlock.com/apple-iphone-3g/rs11wp9/ for just $ 31.26. This method of unlocking an iPhone is very simple,
Here are the steps for unlocking an iPhone 3G,
1. Wait for us to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 3G phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 3G to iTunes with a NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 3G.
6. Disconnect your Apple iPhone 3G and reconnect it after 10 seconds.
7. Your Apple iPhone 3G is now unlocked.