A friend of mine got a locked iPhone 4 from the US. Now she's trying to unlock it, but there's no unlock code available for iOS 4.2.1 with baseband 3.10.01. After a lot of searching I found two twitter accounts supposedly to be the masters of unlocking - Hashim Sherif and MuscleNerd.
Can someone tell me if these two are credible guys? And are there only 2 people in the whole world who can unlock the iPhone?