If your device isn't running Windows 10, refer to the Windows 8 instructions.

1. From the Windows desktop, navigate: Start  > Settings icon  (lower-left) > Network & Internet.
    Utilize the touchscreen (if available) or mouse to select the on-screen options.
2. From the left-pane, select Cellular.
   
3. From the Cellular section, if necessary, select Verizon Wireless (LTE).
   
4. Select Advanced options.
   
5. From the Properties section, view the SIM ICCID.
   

 You can also remove the SIM card and view the 20-digit SIM card number (with the gold contacts facing away).
 Not available on all Windows 10 devices.