I can't activate my iphone, itunes can't see my sim.what to do?

I got iPhone 3gs as a gift, when I tried to restore it to its default I got stuck on this. The msg is this " There's no SIM card installed in the iPhone you are attempting to activate please disconnect and insert a SIM card in the iPhone " can any one please tell me what to do to fix this problem?

Are activating with AT&T or different company?

If you are activating it with a different company, unlock your phone first

If not just put a AT&T sim card on the phone and that's it. You could use it now

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