Unlock iPhone 4 on iOS 5 with Gevey SIM? Well, if you update your iPhone 4 to stock IOS 5 firmware will kill your Gevey SIM and your unlock. To unlock your iPhone 4 on IOS 5 with Gevey SIM , you need to update your iPhone 4 pre-jailbroken custom firmware to preserve the unlockable  baseband  that are compatible with Gevey SIM.

Before I show you how to unlock iPhone 4 on iOS 5 with Gevey SIM - Here's what we gonna do :

• You have to restore iPhone 4 with custom iOS 5 ipsw with Redsn0w 0.9.9b5 (or above) to preserve the unlockable baseband.
• Then you are able to unlock iPhone 4 on iOS 5 with Gevey SIM.

Required Downloads:

• Download Redsn0w 0.9.9b5 for Mac / Windows (Coming soon)
• Download iOS 5.0 ipsw for iPhone 4
• Download iTunes 10.5 for Windows and Mac

How to update iPhone 4 to iOS 5 without updating Baseband - Redsn0w 0.9.95 :

Step 1: Connect your iDevice with your PC via USB and open Redns0w you just downloaded above.

Step 2: Start Redsn0w, press on "Extras" > "Custom IPSW" and then point Redns0w to iOS 5 ipsw firmware that you downloaded above.

 

Now Redsn0w will start cooking your custom iOS 5 ipsw firmware

Step 3: Click on "Pwned DFU"

Step 4: Now make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.

At this stage you will be presented with a screen where you will be guided on how to enter DFU mode. Quickly hold “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.

Step 5: Open iTunes 10.5 then Restore your iPhone 4 to the Custom iOS 5 ipsw (the file name begins with NO_BB).

Congratulations, Now you can unlock iPhone 4 on iOS 5 with Gevey SIM and here's a video show you how to use Gevey SIM :

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