From the Windows desktop, locate then double-click the VZAccess Manager icon. Alternatively, click Start > Programs (All Programs) > VZAccess Manager. With Windows 10, click Start > Apps icon (located in the top-left corner) > All apps (located in the bottom-left corner) > VZAccess Manager.
If presented, enter the PIN then click OK. The default PIN is 1111.
From the top menu, click Help > WWAN Device Info.
The device/software information is displayed. Scroll up/down to view additional information. The ICCID is the SIM ID.