Hello I have an iPhone 3GS and I forgot my password so I restored it, it was successfully restored but while following the steps when I connected to itunes it says Disconnect and insert SIM card, but there is SIM card in it (please help me)

The SIM card already in it is international

If the phone was hacked, you can't get help here.  It would not necessarily have to have been hacked.  Legitimately unlocked iPhones are available from Apple in the U.S. and AT&T (the only US GSM carrier who ever carried the 3GS) offers unlocking.
Try a replacement SIM from your carrier.

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