The Huawei modem models that have been mentioned so far are not listed as supported upstream.
https://live.gnome.org/NetworkManager/MobileBroadband/ If you would like your model to be supported by NetworkManager and modem-manager, please file a request in the upstream bug tracking system https://bugzilla.gnome.org/browse.cgi?product=NetworkManager To save work, we don't track such requests in Launchpad as well --- marking Invalid. ** Summary changed: - NM frequently disconnects mobile broadband and refuses to reconnect + NM frequently disconnects mobile broadband and refuses to reconnect -- Huawei E156G, E620 ** Changed in: network-manager (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/736930 Title: NM frequently disconnects mobile broadband and refuses to reconnect -- Huawei E156G, E620 To manage notifications about this bug go to: https://bugs.launchpad.net/modemmanager/+bug/736930/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs