How to Unlock iPhone OS 4.0 with Ultrasn0w 0.92

Yesterday, we told you about the jailbreaking for iPhone 3G running iPhone OS 4.0 with Redsn0w 0.9.5. Now, you can also unlock iPhone 3G OS 4.0 with Ultrasn0w. After jailbreaking iPhone 3G, you can use Ultrasn0w to unlock it. However, the thing to note here is that  iPhone 3G should have 05.08 boot loader.