GEVEY Sim Unlock for iPhone 4 is an alternative solution to unlock the popular Ultrasnow 1.2.4 of the tool. Now you can unlock iPhone 4, 3G running on IOS 5 and IOS 4.xx with GEVEY Sim, but only with the following basebands: 04.10.01, 01.59.00, 02.10.04, 03.10.01.
So if you have an iPhone 4, 3G runs on IOS 4.xx and has been unlocked with the Gevey Sim and upgrade to iOS 5 here describe Gevey Sim unlock method already is available for iOS 5.
Follow step by step complete tutorial posted below to unlock the iPhone 4, 3G running on iOS 5 with GEVEY Sim, preserve the baseband iPhone.
GEVEY Sim Unlock for iPhone 4, 3G Tutorial:
Step 1: Be sure to use a custom firmware with baseband preserved when upgrading to IOS 5 for GEVEY Sim unlock to work.
Step 2: Turn off 3G in Settings> General> Network
Step 3: Turn the iPhone.
Step 4: Re-insert the SIM card with attached GEVEY SIM and turn on the iPhone.
Step 5: After searching the net a window that appears, click the OK button.
Step 6: After 15 seconds dial 112 and hang up after 2 seconds.
Step 7: Turn on Airplane Mode in the settings
Step 8: Press the OK button when “there is no SIM card installed” appears.
Step 9: Turn off airplane mode. Two windows should appear now, just wait and do nothing until they disappear.
Step 10: After the pop-ups disappear your iPhone should now have a signal bar.
However, if you get any error, simply re-insert the SIM card, reboot and try the process again.