Server doesn't detect SIM slot but Desktop does. (18.04 LTS)

I'm currently working with a Dell Gateway 5000 and Ubuntu Server 18.

When I enter nmcli device or ifconfig, the SIM interface (WWAN) doesn't appear. It shows other ports, such as wired Ethernet. Also, it doesn't even show when the enp1s0 interface is connected (although I do have Internet connection).

Don't know if it's necessary to up the interfaces, installing drivers or something else, and if so, How can I do it?

I tested with Ubuntu Desktop and the WWAN appears AOK.

Thanks in advance.