using my iphone without sim (just upgraded OS)
I have an Iphone which I got a long time ago. In fact I got it when the 16gb phones first came out. Long ago I stopped using AT&T and have been using the phone as an iPod touch for games and music. I upgraded the OS to 3.0 when it fist came out and unlocked it at that time. I have NOT been using it as a phone, except on Skype.
More and more of my apps have been telling me they need a higher OS to function, so I finally let iTunes upgrade my OS. Of course that was a very bad thing to do. Now the phone insists I insert a sim card. I have been using it just fine with no sim for a long time and have no idea where the old sim card went. I DO NOT want to use this on the AT&T network-I just want to play my games and music.
I don't see anyway to restore my old OS,and the phone seems to just be stopped at the insert sim card message. Is there anything I can do?