Relevant issue seems to be that pppd cannot establish the PPP session:

NetworkManager[11397]: <warn> pppd timed out or didn't initialize our dbus 
module
NetworkManager[11397]: <info> Activation (ttyUSB2) Stage 4 of 5 (IPv4 Configure 
Timeout) scheduled...
NetworkManager[11397]: <info> Activation (ttyUSB2) Stage 4 of 5 (IPv4 Configure 
Timeout) started...
NetworkManager[11397]: <info> (ttyUSB2): device state change: ip-config -> 
failed (reason 'ip-config-unavailable') [70 120 5]

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https://bugs.launchpad.net/bugs/1198325

Title:
  Huawei K3770 failed to connect

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