While ago I wrote you article about Ultrasn0w unlock for iPhone 4, 3GS. The tool was developed by iPhone Dev Team and depends on an unsigned code injection vulnerability. This unlock functions by a daemon patching the baseband memory (RAM), spoofing the carrier lock code. It's not eternal due to the signature checks by Apple. The bootloader must successfully pass the sigchecks as well as the baseband. so any update of the baseband and bootloader can't be done. Also many iPhone users face with No Service showing on the status bar of iPhone. We have created a detailed tutorial that will guide you to fix it and enjoy normal and active signal of the SIM card you are trying to use. Here you will see the list of supported iOS's and basebands for Ultrasn0w tool and how to unlock iOS 6.1.3, iOS 6, iOS 5, iOS 4, iOS 3.

Ultrasn0w Unlocking Guides

The latest supported firmware by Ultrasn0w is iOS 6.1.3. If your iPhone running preserved baseband you can successfully use Sim card of your local carrier. Follow steps here:

• How to Unlock iOS 6.1.3 Using Ultrasn0w

Don't worry if you still running iOS 6.1 and don't want to update it. Just follow easy steps on how to jailbreak iPhone and install Ultrasn0w:

• iOS 6.1 Ultrasn0w Unlocking Tutorial

For users of iPhones running iOS 6 / 6.0.1 hackers made update a year ago. Free solution is always available in Cydia. Just go to Search, type Ultrasn0w and install this tweak. Detailed instructions can be found here:

• Use Ultrasn0w 1.2.8 on iPhone iOS 6 / 6.0.1 / 6.0.2

With iOS 7 release we start to forget about iOS 6 and addict to the new version. Simple design is the big start for Apple. In other words: "beauty in simplicity". But what about iOS users who don't even think about iOS 7because they even didn't try iOS 6 as well. Yes, there are still iPhones running iOS 5.1.1, iOS 5.1 and even iOS 5.0.1 and iOS 5. It is time for you to free your iPhone for using your Sim card with famous jailbreak tweak:

• Ultrasn0w 1.2.7 Unlock iOS 5.1.1 iPhone 3G/3GS/4
• Unlock iOS 5.1 / 5 Using Ultrasn0w 1.2.5

And the last tutorial guide is for iPhone 3G users running iOS 3.1.3 firmware. Just jailbreak iPhone and run Cydia. Add repo and install tweak. Follow the link on how to get it for free:

• iOS 3.1.3 iPhone 3G Unlocking with Ulrasn0w

That's it. As you can see all instructions have the same steps and consistancy. Unfortunately this tweak doesn't support iPhone 4S and newer models as well as all iPhone 4 basebands. However anytime you can find factory unlocking solution and forever forget about it