How to use Gevey sim on iOS 5?

Note: You must not update to iOS 5 directly from iTunes. You need a custom firmware to preserve iPhone 4 baseband to 04.10.01 or below, so that Gevey can work. Gevey doesn’t work with iOS 5′s baseband.

If you’ve restored to factory iOS 5, go back to iOS 4.3.5. Apple is still signing it!

1. Download iOS 5 IPSW for iPhone 4 (Download links here)

2. Download sn0wbreeze 2.8b8

Note: sn0wbreeze is only for Windows. If you’re on MAC, please wait till iPhone Dev Team releases the updated redsn0w which will support baseband preservation.

3. Build a custom firmware using sn0wbreeze 2.8b8. This custom firmware will preserve the baseband. You need baseband 04.10.01 or below to make Gevey work

4. Restore this custom firmware from iTunes using Shift+Restore

Note: If you get errors 1600, 1604, etc. use iReb to put your iPhone 4 into pwned DFU mode. iReb can be downloaded from ih8sn0w.com

5. After iPhone successfully restores, activate it

6. Switch off the iPhone & insert Gevey sim. Start your iPhone 4

7. You’ll get Gevey Menu after the iPhone boots up. Accept it

8. Wait for up to 10 seconds after accepting till you get No Service

9. Dial 112 & hang up within 2 seconds

10. Go to Settings & turn on Airplane mode. Wait till you get “No sim inserted” message

11. Once you get the message, click Dismiss & turn off the Airplane Mode. You’ll get “Sim failure” message which will automatically get dismissed

12. Then within a few seconds, your iPhone 4 will get the network