How to Unlock iOS 5.1.1 iPhone 4 / 3GS Using Ultrasn0w 1.2.7?

It is very hard to unlock iPhone these days. iPhone Dev Team didn’t say even a word about unlocking solution for such basebands as 04.12.01, 04.11.08, 05.15.01. But if your iPhone is out of these basebands and running iOS 5.1.1 you can easily use Ultrasn0w 1.2.7. Ultrasn0w is unlocking tool that give you the possibility to use any carrier after unlock. Do it once and enjoy it till you will decide to update or restore your iPhone to the newer iOS.

Ultrasn0w 1.2.7 was developed by iPhone Dev team especially to unlock iOS 5.1.1 on iPhone 3GS and iPhone 4. The tool was created only for old basebands so you better check what baseband was on your device.

To do this, just go to Settings – General – About and scroll down to Modem Firmware. These 6 digits are your iPhone baseband number. So let’s check if your baseband supports Ultrasn0w 1.2.7.

iPhone 4

  • 01.59.00

iPhone 3GS

  • 04.26.08
  • 05.11.07
  • 05.12.01
  • 05.13.04
  • 06.15.00

If you found your baseband you were lucky one and we could start unlocking process. But you have to do one thing before we start. You need to install Cydia. To perform this you have to jailbreak your gadget using one of these tools:

  • Redsn0w
  • Absinthe 2.0
  • Pwnagetool 5.1.1
  • Sn0wbreeze 2.9.5

Only after jailbreak you can locate Cydia icon on your iPhone’s Home screen and only then we can begin the process.

Unlock iOS 5.1.1 Using Ultrasn0w 1.5.7 On iPhone 4, 3GS

Note: Before we start take your Sim card out of iPhone.

Step 1. Open Cydia and wait till the end of reloading data.

Step 2. Go to Search and type Ultrasn0w 1.2.7. If you find it install it but if not then go to Manage – Sources – Edit – Add. Now you need to add this repo:

http://repo666.ultrasn0w.com

Step 3. After adding the repo go to Search, find Ultrasn0w 1.2.7 and install it.

Step 4. Wait till the end of installation process and Restart Springboard.

Step 5. The last thing that you need to do is to insert Sim card of the carrier you want to unlock and wait till you will see the active signal.

That’s all you need to do. But remember that you can’t update or restore your iPhone via iTunes. You will lose unlock.

So make / answer the calls and enjoy unlocked iPhone 4 or 3GS thanks to Ultrasn0w 1.2.7 and its creators. Stay tuned with us for more updates and how to tutorials.

Abdul Rehman

Abdul Rehman who is one of the founders of this site is also a blogger, SEO professional and writer of this site. Add him in Cricle on Google+. Follow him on Twitter