iPhone 5: Phone Won't Accept Correct Sim Card

I purchased an iPhone 5 from someone through classifieds and they had said it was with Rogers. I tried using my Rogers nano sim and won't accept it for activation. I have tried activating it through iTunes as well with no success. I called Rogers support and gave them the cell phones IMEI # and they confirmed that it was with Rogers. I am not sure what else to try. Any help would be vastly appreciated.

Source: http://www.ifixit.com/Answers/View/119749/Phone+Won't+Accept+Correct+Sim+Card

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