Some 3G modems work in USB CDC Ethernet mode. This means that the computer sees them as a network card, and not as a modem. In this case, the connection setup is more similar to the LAN/WAN interface setting than the modem setup.

Let's look at setting up a connection to the Kyivstar network using the Huawei E3531 modem as an example.

On the Network→ Interfaces page, click the “Add new interface …” button.