HT201337: Remove or switch the SIM card in your iPhone or iPad
Learn about Remove or switch the SIM card in your iPhone or iPad
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Helpful answers
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Jan 26, 2016 11:35 AM in response to kathleenmoobby Phil0124,The iPhone 4 came in 2 types. GSM and CDMA.
The CDMA versions do not have a sim card and by extension no sim card slot.; These iPhone's can only be used with the CDMA carrier they were originally sold for, and cannot be used with sim cards from GSM carriers.