[abbaiah]

When i downloaded the OS3.0 to my 2.2.1 OSversion 3G 16GB iphone recently, the following message flashed and my iphone got locked!

"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 Card that came with your Iphone or visit a supported carrier's store to receive a replacement SIM Card".

The original SIM Card is "O2 of UK". When i visited US i have used AT&T Sim Card and it was working fine. Even when i used another SIM Card in India it was working fine with unlocking SIM card till i downloaded 3.0 software.

I request our beloved members to advise me IMMEDIATELY to activate my iphone and regret for the inconvenience caused in this regard.

[amitbakhru]

I'm having the same problem. Can somebody please help.

I know I've done something stupid. But I'm new to iPhone.