Restore iPhone4 from 4.1 to everything before!
I bought my iPhone4 from a friend in France. It was unlocked to use in Belgium, but since I updated it via iTunes to the software version 4.1, I can't call or text. He says "no service" or "invalid sim card".
Do I just restore my iPhone in iTunes? Will it work again, or will iTunes just reinstall the 4.1 version of the software? Can I choose to restore with the previous version of the software, because then I was able to text or call.
Thx a lot to those with the helpful answers!