I tunes isn't registering that there's a sims card in my iphone 4?

Okay, a couple weeks ago i bought this fully functional I phone 4 from Amazon, a couple hours after i got it all set up, it said i needed to restore, so i went through the motions, but Itunes isn't recognizing my sims card. So I though ti'll just buy a new sims card and it'll fix it, but the problem is still persisting. What do I do?

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