What do i do to make the SIM cards work?
I have a 4.6 bootloader iphone which was 1.1.2 OTB, i tried upgradind to 1.1.3 and then I tried to downgrade with iTunes and it came up with an error , so, i looked if it was downgraded, and it looks just like a 1.1.1 ready for activating. It booted up after the error and looks fine. All wrong is the SIM card prob!It says: "Incorrect SIM insert an unlocked and valid sim to activate iphone". heres the video tutorial I used:
[ame="http://es.youtube.com/watch?v=YakjwxB3nQU"]YouTube - How to Downgrade from 1.1.3 to 1.1.1 on ipod touch or iphone[/ame]

thanks in advance and please help me!