How to fix my iphone 3gs after updating to ios 6?

I updated my iphone 3gs with ios 6 and now its saying activation error and it won't let me do anything. I don't have service on the phone I just use it for the Wi-Fi and games but these won't even work now. Does anyone know how to fix it?

Added (1). I can't restore it, it won't let me do anything and when I connect it to itunes it just says can't activate now or something like that.

Restore it

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