My case: my brother accidentally upgrading my current firmware to the latestest firmware..
and becoz my iphone being jailbroken previovsly, and results to the my iphone can't recognize my sim card..
and there is a image shown there plug sync to the itunes. Nothing happen once i sync to the itunes and itunes can't recognize my device.. =.="
i try to jailbreak again.. Finally comes to the last step and everthing working well as guide as shown on the website..
But after that.. the iphone is stil having the same situation.. can't recognize the sim card..

One weird thing is that.. it is normal i can't calling someone.. but instead of that i can retrieve call.. ZZzz

How now?