How to Fix Error Message “Different SIM Detected” on iPhone 4 / 3GS / 3G After Jailbreaking with JailbreakMe and Activating with a PhoneBook Card

As we all know the new JailbreakMe userland browser based jailbreak doesn’t hacktivate phones so if a user with an unofficial SIM restores / upgrades to the latest 4.0 or 4.0.1 firmware (or any firmware for that matter) then the iPhone will be locked with an “Activation Lock” / Emergency Calls Only Screen.
iPhone Hacker Sherif Hashim found a new way to activate phones without having the original SIM cards but as usual and as expected, Apple found out about the phonebook SIM card trick and blocked this loophole.
If you have activated your iPhone using Phonebook SIM card method, you will probably see this error message “Different SIM Detected” on the lockscreen of your iPhone as you see it in the screenshot below. Don’t worry though, you can fix this issue by following our detail steps listed below. Read more…
