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Re: Using wvdial and usb_modeswitch to connect to internet with usb internet key

I cannot help you with wvdial, I have used this rarely looong ago for
simple dial-up (no 3G/4G).

NetworkManager itself (not its applet) does not depend upon any GUI part
and nmcli (command line) and nmtui (ncurses text interface, roughly
equivalent to nm-applet) are included in the package.
NetworkManager depending on Modemmanager and usb_modeswitch, it would be
easy for you to manage your 3G/4G dongle.