Absinthe is the first untethered jailbreak solution for the iPhone 4S terminal and with its help we can jailbreak even the iPad 2 tablet with iOS 5.0.1 installed. Now that the jailbreak solution is available, it would be a good idea to save the SHSHs for the current versions of iOS because you never know when and how you will need them in the future. For starters, I recommend you to download TinyUmbrella from here and save SHSHs for iOS 5.0.1 and iOS 5.1 beta 2/3, the versions for which the program was set to do this automatically. This step is very important for the iPhone 4S and the iPad 2 tablet, devices that will need something like this to restore. You can save SHSHs even without jailbreaking.
Now let's go to unlock. If you have an iPhone 4S and want to decode it somewhere in the near future, then it would be good to read the following carefully. If you have iOS 5.0 on your device then this tutorial it helps you untethered jailbreak and you have to stay on iOS 5.0 until the Dev Team releases an unlock solution. For those who have iOS 5.0.1 installed, MuscleNerd says that the 9A405 build has a different baseband from the 9A406 and that a possible unlock solution could come for that initial iPhone 4S build. If you need an iPhone 4S unlock, then MuscleNerd recommends that you install the 9A405 build of iOS 5.0.1 to be sure that the unlock solution will work with your device. Apple signs SHSHs for both builds of iOS 5.0.1 for iPhone 4S so you can revert to the old build 9A405 by download this ipsw and its use for restore. The procedure is simple, you just have to connect the iPhone to the computer, open iTunes, hold down the shift button (alt+o on Mac) while pressing Restore from iTunes, choose the downloaded ipsw and wait until it is finished the restore.
If you have the SHSHs saved then you have a good chance of being able to use them in the future and if you have the 9A405 build installed on your iPhone 4S then there are good chances that you will be able to unlock if such a solution is released.
