Honeywell Dolphin CT60 Series Quick Start Manual page 6

Install a microSIM Card (SIM 1)
Phone feature is available only on CT60L1N models.
On all models, when using a UICC card for NFC Secure Element
link encryption, install the card in SIM slot 1.
Note: Always power off the computer and remove the battery before
attempting to install or remove a card.
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