In my older ThinkPad, the SIM was a slot behind the battery. In a later model, it's a tray that has to be opened with a paperclip next to the card reader. The modem itself is a mini PCIe card like they're used for some laptop SSDs and antennas are in the screen like wifi antennas.
Ah yes, thanks! I have used a similar USB dongle. I was wondering if it was a special built-in tray or slot in the laptop.
My laptop does have a sim tray and an internal modem, the antenna is in the screen. (HP Spectre x360 13" for those curious)
In my older ThinkPad, the SIM was a slot behind the battery. In a later model, it's a tray that has to be opened with a paperclip next to the card reader. The modem itself is a mini PCIe card like they're used for some laptop SSDs and antennas are in the screen like wifi antennas.