WWAN - Wireless Wide Area Netowrk- Uses Cell towers to connect to Internet. Dell Latitude 5401 - install second SSD into WWAN slot! 44,796 views44K views. Quick video on experimenting with the WWAN slot (Dell e7240, but likely the same for similar. Latitude E6x20, E6x30 have WLAN/WWAN slots that are mini PCIe/USB only. Hi, I have a Dell Latitude system. I do not see any documentation that we tested/validated a M.