Hi folks! I am having a terrible issue on my iPhone 4. Recently, I have restored my iPhone 4 to custom iOS 5.0.1 after experiencing some app crashes on iOS 5 firmware. Aside from app crashes, I also experienced poor network signals on iOS 5. So I used Redsn0w 0.9.9b8 to create iOS 5.0.1 custom firmware and then restored it using iTunes. Then after restoring I encountered “No SIM Card Installed” error. I already tried to reset my network settings as well as eject and re-insert my SIM card but no success. What else do I need to do to fix this? Thanks.
Asked by: Norman from Sunnyvale, California
If you still got the same error after performing the aforementioned tips, then the only solution available is to restore your iPhone to the stock iOS 5.0.1. Unfortunately, this process will update the baseband of your iPhone and there’s no way you will be able to downgrade it and you will not be able to unlock your iPhone form its contracted mobile phone carrier using Gevey SIM. That’s it! Good luck.