To get the easiest and most reliable Unlocking iPhone 4 5.1 solution, visit: Unlock iPhone 4 Software
Apple keeps updating its hardware and firmware frequently and so, unlocking the iPhone 4 5.1 has obviously garnered interest. Whenever a new iOS firmware upgrade is pushed, everyone wants to upgrade their firmware. The iOS 5 operating system was launched with a lot of hype and most of the expectations were met. The in-depth review about iOS 5.1 is not yet available, but all we can say is this iOS 5.1 firmware upgrade is good for everyone. If you have restrained from upgrading to iOS 5.1 until now for fear of losing jailbreak or unlock, you should know that jailbreak and unlock iPhone 4 on 5.1 are available. So, there is no reason to hold you back from upgrading, but your choice of jailbreak and unlock iPhone 4 tool should be wise. This is because many of the jailbreak websites are making false claims as to the availability of the unlocking process for iPhone 4 and 4S models. Some baseband firmware versions are not actually able to be jailbroken, while some basebands are not able to be unlocked as well. That is why we are making the distinction on the two processes, and even though you might want to unlock iPhone 4, we suggest you read this information before unlocking it.
Can Unlocking an iPhone 4 5.1 be possible?
Before knowing about unlock iPhone 4 5.1, it is better to understand the importance of firmware upgrade. When you buy iPhone, it is preloaded with the current firmware version and it is your choice to determine whether or not you want to upgrade the software. It is always better to download and use new software versions because Apple patches exploits and security loopholes. On the other hand, it can be troublesome for iPhone users wanting to unlock an iPhone 4 because patched security exploits prevent jailbreaking an iPhone 4 as well. The new iOS 5.1 firmware is liked by many iPhone owners as it solves battery drain issues as well as patches many of the 5.0.1 bugs previously reported. With the new updated firmware, the carriers will be able to provide HSPA+ networks and many users have noted AT&T changing 3G to 4G in iPhone 4S after iOS 5.1 upgrade. Phone camera is now easily accessible, thanks to the small update in the newer firmware version. Photos from Photo Stream can now be finally deleted and those who have had problems with limited memory storage can benefit from this added functionality after an iPhone 4 5.1 unlock process. The launch of Japanese SIRI is going to be beneficial for those who are using an unlocked iPhone 4S. Numerous bug fixes and interface tweaks are also made available with the iOS 5.1 firmware. All in all, if you haven’t upgraded to iOS 5.1 firmware, then you are missing out a lot of interesting things with iPhone 4. As unlock iPhone 4 on 5.1 is available now, you don’t have to stay behind with old 4.x firmware anymore. Modifying updated iPhone firmware is possible if you have the correct software to perform the process, as well as an updated iTunes version.
Unlocking the iPhone 4 5.1 using Ultrasn0w fixer
If you always want to use free methods for unlocking the iPhone 4 5.1, then you will be happy to know that Ultrasn0w fixer is available to unlock your iPhone 4. Of course, this option is feasible only if you have an unlockable baseband. For quite some time now, Ultrasn0w is simply upgraded to extend support and no new basebands are supported. The Ultrasn0w Fixer is not the official unlocking software from Dev Team. A hacker by the name “zmaster” has his own Repo called Ultrasn0w Fixer which claims to be an interim fix for the Unlocking iPhone 5.1 Firmware.
- Step 1: Download iOS 5.1 stock firmware, latest version of iTunes and Redsn0w.
- Step 2: Launch Redsn0w.
- Step 3: Click on Extras and click on Select IPSW. Choose the iOS 5.1 stock firmware file.
- Step 4: Click on Custom ipsw firmware and let Redsn0w build the firmware.
- Step 5: Follow the instructions on screen and connect your iPhone to your computer. Let Redsn0w custom build ipsw firmware to preserve baseband.
- Step 6: After custom ipsw firmware is built, click on Jailbreak button.
- Step 7: Put your iPhone in DFU mode for Redsn0w to complete jailbreak.
- Step 8: Go to iTunes and click on Restore button to select custom cooked ipsw firmware.
- Step 9: Your iPhone should be jailbroken by now and you should see cydia in your iPhone hoem screen.
- Step 10: Launch Cydia and select Manage -> Sources.
- Step 11: Tap on Edit and tap on Add.
- Step 12: Add the repo http://repo.iparelhos.com.
- Step 13: Once repo is added, search for Ultrasn0w Fixer utility and install it.
- Step 14: After this is installed, add http://repo.ultrasn0w.com and install Ultrasn0w 1.2.5.
- Step 15: Reboot using Redsn0w tethered reboot to find an unlocked iPhone 4 on 5.1 firmware!
Unlocking iPhone 4 5.1 without worrying about firmware or baseband
The free method to unlock iPhone 4 on 5.1 is very complicated and the authenticity of Ultrasn0w Fixer can’t be verified. There is always a risk of bricking the iPhone if you end up messing the free jailbreak and unlock instructions. Moreover, the free methods can’t be used if you have accidentally upgraded baseband without using baseband preservation mode. It is possible for unlocking iPhone 4 on 5.1 without worrying about firmware or baseband upgrading and trying to hack iPhone firmware manually. After testing at various levels, we recommend this computer based software which can unlock and jailbreak iOS 5.1 in only a few minutes. Visit: Unlocking iPhone 4 5.1

This quick guide for unlocking iPhone 4S is assuming you have downloaded a real and working iPhone 4S unlocking tool, such as the one suggested from this website.