CDMA phones that have 4GLTE are not GSM phones and cannot use GSM SIM cards.
The reason it has a SIM card slot is because GSM and CDMA phones both use the same radios and radio frequencies for 4GLTE data. On GSM phones, it just uses 1 SIM card for all of the phone's programming. On CDMA phones, there is a lot of internal programming and the SIM card only carries information for 4G.
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