Dharris08, you deserve to be able to use that phone for service. We are here to help get you on the right path. The iPhone 5S uses a Nano SIM card, but if you do not have one already activated with us you will need to visit a corporate store location. There we can help get you a new SIM and activate it before installing it into your phone. Here is a link to locate one of our stores http://vz.to/1NI4DWL
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