How To Factory Unlock iPhone 4 iOS 4.0.1 Free [Updated] 2016
After a long expectation, the Dev Team just released an updated version of UltraSn0w that will unlock the iPhone 4 as well as the iPhone 3G and 3GS running iOS 4.0.1.
You should see UltraSn0w in Cydia under the repo666.ultrasn0w.com repo.
Good job, Dev Team! Good job.