How can I get contacts that were put on by the phone to the sim?

I have about 100 contacts, about half of which were already on the sim card and the other half were added using the phone. I just got a new macbook and now I'd like to restore my iphone so everything is synced with this computer. How can I keep all these contacts without writing them all down. It'd be nice if I could just sync them all to my sim card then import them later but i don't think i can do that. Any suggestions?

The iPhone cannot write contacts to the SIM card like other GSM phones; however, it can read contact from a SIM card.

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