To insert the SIM Card , locate the SIM card slot on the left-hand-side of the device. There is a cover on the SIM card slot that you need to open before you’re able to insert the SIM card. Use the tiny gap between the cover and the edge of slot compartment to pull out the cover with your finger nail.
My collection of Home Assistant, CoreELEC, IoT, Synology, Kodi and other technical tips gathered over the years.