SIM card If you have not installed SIM card. Prior to the installation settings. iPhone IMPORTANT: to use the micro-SIM card (iPhone 4s) or nano-SIM card (iPhone 5 and above) to use cellular When connected to GSM and CDMA networks, some networks the iPhone open throttle. use in CDMA wireless network may use a SIM card to connect to the GSM network for roaming by using your iPhone is essentially the policy of your wireless service provider. Which may include restrictions on switching service providers and roaming, even after the service by the end of the minimum period stipulated in the agreement said. Contact your ISP for more information. The ability to use mobile systems based on the capabilities of your wireless network.
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