I recently bought an unlocked iPhone 4 from the US. I live in the UAE. I had a normal SIM card and I cut it and installed it into iphone and it started working.
But when I tried to upgrade to the most recent iOS version using iTunes, at the end of the installation it says
Your SIM card does not appear to be supported.
When I went to my carrier office they gave me SIM card which works in their iPhone (UAE) but it does not work in my iPhone (US).
I am worried about what happened to it. I bought it just one week back. Now I am not able to even start it; it's not detecting my SIM (which is working in other iPhone).
Any idea what the problem is? What should I do? Shoud I format it?