[ NoAccessorMethod ]
public abstract GdbusModem3gppUssd modem3gpp_ussd { owned get; set; }
The GdbusModem3gppUssd instance corresponding to the D-Bus interface <link linkend="gdbus-interface-org-freedesktop-ModemManager1-Modem-Modem3gpp-Ussd.
top_of_page">org.freedesktop.ModemManager1.Modem.Modem3gpp.Ussd</link>, if any.
Connect to the notify signal to get informed of property changes.