Ok I'm new to unlocking. I did it once a long time ago on my 3G but never actually used the feature. I have an iPhone 4 and I'm going to Europe in about 2 weeks. I updated to iOS 4.3.3 without knowing about the whole baseband issue. Am I screwed now or can I downgrade to 4.2.1 (using custom IPSW) and then unlock with UltraSn0W after jailbreaking? Any help is much appreciated!