
There are two methods of unlocking an iPhone device. One is the software based solution provided to us by iPhone Dev Team using Ultrasn0w. Remember Ultrasnow is unable to unlock iOS 4.3.4 or iOS 4.3.5.
The other method is to use a hardware based method which is Gevey Sim that can unlock iPhone 4 on higher basebands. The latest firmware iOS 4.3.5 can be unlocked using Gevey Sim.
iOS 4.3.5 is very similar to iOS 4.3.4 firmware except for few bug fixes. If you prefer a software based unlock using ultrasnow, you better stay on iOS 4.3.3 on which Ultrasnow 1.2.3 works fine on lower basebands. For higher basebands you still have to use GEVEY.
Remember that Apple has blocked GEVEY SIM method in iOS 5 Beta 2. Although still there are methods which can be used to unlock iOS 5 beta as well.If you need make money with iphone Apps,download ebook here!