If the 19 to 20 digit number also known as the ICCID on the SIM card starts with 89011, it is CDMA. If the ICCID begins with 89012, it is a GSM SIM card.
You can also look at the color of the text on the SIM card. If the "republic" text is gray, it's CDMA. If the "republic" text has green in it, it's GSM.
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