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How can I tell if an iPhone 5 is CDMA or GSM (without SIM)?

How can I tell if an iPhone 5 is CDMA or GSM (without SIM)? Follow publicly Follow privately Unfollow Say I am looking to buy a used iPhone 5. How can I tell if it is CDMA or GSM? Is there a way to check the settings or something? I don't have SIMs for .....

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