iPhone not working - The SIM card inserted in this iPhone does not appear t
I have downloaded new version of iTunes 8.0.2 , installed it on my PC. I attached my iPhone to computer and update it with new software (iTune 2.2.1 i think) via iTune 8.0.2 software .... After installation iPhone works well for about 10-15 minutes. Later it don't close any application while pressing button on it. I decided to restore it so it may work with older itune version. When i restored backup... it say 'The SIM card inserted in this iPhone does not appear to be supported' ... whereas the same SIM was working ....
What should i do now ?
Core 2 Duo, Windows XP Pro, Intel 2GB RAM