If you were given a SIM card to install, install it before setting up iPhone.

Important: A Micro-SIM card (iPhone 4s) or a Nano-SIM card (iPhone 5 and later) is required to use cellular services when connecting to our Madstar Mobile CDMA networks.

Images of iPhone showing how to insert a SIM card. First, insert a paper clip or the SIM eject tool into the small hole of the SIM card tray on the right side of iPhone to eject and remove the tray. Then place the SIM card in the tray—the angled corner determining the correct orientation—and insert the SIM card tray back into iPhone.