Carrier Lock on SIM card
How can I remove the Carrier Lock from the SIM card on a Verizon iPhone X?
iPhone X
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The carrier lock is not on the SIM card, it is recorded in Apple’s activation server. You need to contact Verizon and ask them to remove the carrier lock. See ➡️ How to unlock your iPhone for use with a different carrier - Apple Support
You might first check to see if it IS SIM locked; Verizon generally does not lock phones unless a phone is financed through Verizon.
Go to Settings/General/About and see what it says for Carrier Lock.