If you receive a SIM card error, ensure that you have the correct SIM card inserted in the iPhone.

See Activate-an-iPhone for more information.

If you’re activating a used device, make sure to insert your own SIM card first.

Activation amy begin automatically. If not you will be prompted for Verizon account information before proceeding. .

If no other phone line exists on your account or is active, you will need to contact customer service to complete the switch. [2] X Research source

If you do not have one, you will need to purchase one in order to use your phone with Verizon.