Simplest solution to this problem:

open with root permission:
sudo gedit /etc/rc.local

Now add this line above exit 0

(while :; do nmcli -t nm wwan on; sleep 1; done)&

Save the file and exit.

This is the best solution i have tried, it works in all situations.

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https://bugs.launchpad.net/bugs/848164

Title:
  Auto connect to 3G network only works after manually enabling mobile
  broadband after modem inserted/bootup/resume

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