hi all... i tried upgrading to 3.1.2 but i got the following msg... all your help and suggestions are greatly appreciated... Thank you!!!
Iphone.. 3G 8GB
"The SIM card inserted in this iPhone does not appear to be supported
Only compatible SIM cards from a supported carrier may be used to activate iPhone. Please insert the SIM that came with your iPhone or visit a supported carrier store to receive a replacement SIM."