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Get Debug Logs

# stop NetworkManager
sudo killall NetworkManager

# restart modemmanager with --debug and put output in /tmp/modem.log.txt
sudo killall modem-manager; sudo modem-manager --debug 2>&1 | tee /tmp/modem.log.txt

# start networkmanager and put log in /tmp/nm.log.txt
sudo NetworkManager --no-daemon 2>&1 | tee /tmp/nm.log.txt

Run mm-test.py

# get the latest mm-text.py from git
wget http://cgit.freedesktop.org/ModemManager/ModemManager/tree/test/mm-test.py

# and run mm-test.py (with modem-manager running)
python ./mm-test.py

attach the output a bug.