Hi friends
there is no unlock for iphone baseband 4.11.08 even with Gevey sim
so you need to DOWNGRADE to 4.10.01 and then you can actually Unlock it using GEVEY SIM
but you need to do it really fast as Apple Stops signing the older iOS versions after it releases the new version of iOS but for your luck Apple is Still signing iOS 4.3.5
so here are the steps you need to follow
STEP 1: Remove iTunes 10.5 and install iTunes 10.4 or any previous version.
STEP 2: Download
iOS 4.3.5 for iPhone 4 (GSM)
STEP 3: Enter your iPhone 4 in DFU mode.
STEP 4: Now connect your iPhone with computer and run iTunes. It will show recovery mode message.
STEP 5: Windows users should press and hold the “Shift” key and click on “”restore” and Mac users should press and hold the “Alt/Option” key and click on “Restore”. You will be asked for an IPSW file. Select the one you downloaded in STEP 2 and click on “Open”.
STEP 6: Once the verification process get completed, you will be on iOS 4.3.5. Insert the official SIM to activate iPhone 4.
hurray you are done !
Now its time to upgrade to iOS 5 while preserving the baseband to 4.10.01…
follow these steps
Step 1- Download custom iOS 5
Step 2- Download Redsnow 0.9.9b5
Step 3- Run Redsn0w and then get your iPhone in DFU Mode ( you can do it without Redsn0w if you know how to do it)
Step4- connect itunes with your iphone, now
Restore with the custom downloaded iOS 5
Shit + Restore on windows
Option+ Restore on Mac
once this process is over, you will have your iphone runing iOS 5 but with 04.10.01 BB
ENJOY
please leave your comment or email me ifyou have any problem