When a smart card reader is equipped, the slot is “open”. The cover is only when the device is not equipped with the reader to block the opening.

I was able to do a search and according to the manufacturer this model has a "preparation", so it is possible to retrofit a WWAN connection. Manufacturer information: WWAN: WWAN Upgradable to 4G SIM Card: None Optional ports (configured): 1x Smart Card Reader 1x Nano-SIM Card Slot You are welcome to contact us for detailed advice, otherwise you would have to check with the manufacturer, as I am currently doing, whether the configuration is prepared or simply cannot be retrofitted.

Thank you for pointing this out, the correction has already been requested. According to the manufacturer: 14" WUXGA (1920x1200) IPS 400nits Anti-glare, 100% sRGB, 60Hz, Low Power

This model does not have a broadband modem (i.e. no Internet via SIM card), although it does have a SIM card slot.