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.
If the SIM card is already installed in your phone, you can verify the SIM type in your Republic app(Republic app version 3.21 and above)
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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