Do you want to activate your iPhone to use with other sim card ? If yes, you need to unlock it from your service provider or get Remote unlocking method from any of the online vendors like http://www.prounlocking.com/apple-iphone/rs16wp9/ to unlock/activate it . After unlocking your iPhone, you can use any other sim cards internationally .
even if you don't have an original simcard, u can use any type of a sim to unlock it. you have to get itunes installed in it.This will not unlock your iphone sim free , but it will pass the anoying activation request , and keep you from doing many emergency calls in order to find wifi conection and access online.
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