iPhone 4 Unlock
Unlock for iPhone 4 is entirely a different story altogether. iPhone Dev Team released ultrasn0w 0.93 this past week which can unlock all basebands, including the newest 05.13.04 on all iPhones (except iPhone 4). Before iPhone 4 was released, it was initially believed that this version of ultrasn0w will also be able to unlock iPhone 4. But now according to this report from ModMyi Forums, iPhone 4 unlock will require complete rewrite of ultrasn0w software because of the new baseband OS in iPhone 4.
The DevTeam and others have been checking through the iPhone 4, and have noticed the baseband runs a completely different OS than on previous models. The iPhone 3G and 3G[S] both ran Nucleus OS on the PMB8878 baseband CPU (aka XGold 608), where the iPhone 2G ran the PMB8876 (aka S-Gold 2). iPhone 4 uses the PMB9800, or X-Gold 618 – running a separate OS – ThreadX, an RTOS by ExpressLogic.
So what this means is that an unlock for iPhone 4 wont be out anytime soon. So if you are an International user, you are good to go with unlocked versions of iPhone 4. US iPhone 4 users will have to wait for long before they can use this device on carriers other than AT&T.
