As an FYI every single iDevice on all the firmwares up to iOS 5 are currently lockable. It’s just that some of them are either very complicated, or possibly illegal depending on your location. I’ll get to that later, but first let’s deal with unlockable basebands.
All of the following basebands are easily unlockable using ultrasn0w, on any iOS device.
4.26.08 – 5.11.07 - 05.12.10 – 05.13.00 - 06.15.00* – 01.59.00
These are only on iPhone’s that have a firmware below 4.1 If you have any of these basebands your iDevice is unlockable and pain free. Just follow this simple video tutorial.
If you have the original iPhone 2G. You will need to use BootNeuter.
If you have an iPhone 3G or 3GS running iOS 4.1 or above. Yes your iDevice is unlockable, but it is a bit more complicated and comes with a couple risks. For example GPS may be disabled on your device, and you may permanantly void the warranty on your iDevice. To unlock your iDevice on 4.1 or above click here. To see a simple video of how to unlock it click here.
If you have an iPhone 4 running iOS 4.1 or above you cannot currently unlock your device using ultrasn0w. However there is a work-around that will enable you to unlock your iPhone. It is with a sim-interposer. There are a couple of different ones options out there. We’ve tried the Gevey-Sim Pro on the iPhone 4 running iOS 4.3.3 and it works like a charm. To see how the Gevey-Sim Pro works click here.
*This indicates that you will be using the recycled unlock, which flashes your iPhone’s baseband to an iPad’s 6.15.00 baseband. Process is currently irreversible.