I updated an iPhone (3G/3GS) to iOS 6?

And now I can't activate it.iTunes says there's no sim card installed on the phone. I tried every solution i found but nothing works.installed iPad baseband through redsnow.jailbroke with redsnow. But i still can't get rid of the activation screen. I'm not sure if its 3g or 3gs.a friend gave it and there's no way i can get a sim of the original carrier now. Please help:=O

btw, i tried this one too… (the conversation at the bottom)
http://www.pocketables.com/forum/showthread.php?t=566

Jailbreaking is illegal. I reported you to apple

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