Maybe this trace is the key here:

Mar 24 10:27:01 ubuntu-phablet NetworkManager[1377]: <info> (ril_0):
device state change: prepare -> failed (reason 'no-secrets') [40 120

I have seen this error in some cases where I was unable to start a
cellular data connection. Rebooting solved the issue, and when the
connection started you could not see that trace in syslog.

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https://bugs.launchpad.net/bugs/1435776

Title:
  NM does not activate a valid ofono context

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