I had a thinkpad at one point that had a slot, but because it wasn't optioned for it you had to patch the BIOS or it wouldn't boot with anything in the slot, it seemed so hostile as to be worthless.

I'm on an X1 Yoga, and it has a SIM card slot and antennas, so it just requires an m.2 modem to get going.

At least with Lenovo laptops, that is very common. You con't need to order the laptop with a radio; it can be easily upgraded.