Quick solution that requires no recompilation:

1- create a script at /etc/network/if-up.d/ called usb0 (name doesn't matter)
2- give it the following contents:

#!/bin/sh

logger "running dhcp client on $IFACE to work around modem manager
problem..."

if [ "$IFACE" = "usb0" ]; then
       dhclient usb0
fi

3- make it executable

You will see that one the interface gets the IP (that comes apparently
from AT commands) dhclient is started and obtains again an IP, but this
time along with a default gateway.

Of course this is not a "proper" solution. Modem manager should know
which modems need DHCP and which ones do not.

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https://bugs.launchpad.net/bugs/861282

Title:
  19d2:1015 ZTE K3806-Z network connection established, but does not
  work

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