If you rely on a software based unlock for your iPhone 4 and are stuck on a higher baseband like 2.10.04 / 3.10.01 on iPhone 4, the only way to unlock iPhone 4 up till now was through the Gevey SIM interposer which can unlock iPhone 4 baseband 2.10.04 and 3.10.01 by forcing baseband activation via the emergency dialler. While Gevey SIM iPhone 4 unlock is illegal, there is another solution for unlocking iPhone 4 baseband 2.10.04 and 3.10.01. A hacker named Dill Huang has been able to unlock iPhone 4 on the above mentioned basebands, without requiring Gevey SIM. As proof, he has also posted a video.
However, this video is just a proof on concept as this iPhone 4 baseband 2.10.04 / 3.10.01 unlock has been achieved under extraordinary circumstances. The hacker has two SIM cards. One with a real IMSI value and one with a test IMSI value. Obviously, your carrier won’t hand over a SIM card with a test IMSI value to you, hence the extraordinary circumstance for this baseband 2.10.04 / 3.10.01 unlock.
Video demonstration embedded below:
First, he inserts the SIM with the real IMSI value and dials 1122 and then hangs up after 2 seconds. He then toggles the iPhone into flight mode and removes the SIM card. Then he inserts the SIM with the test IMSI and toggles flight mode off and voila, the iPhone 4 is unlocked on baseband 3.10.01.
Once again, you won’t be able to do this unlock procedure on your own device, however lets keep waiting for the 40 bit NCK hack for unlocking iPhone 4, that the iPhone Dev Team is working on.