FWIW, additional details are given in a threads http://permalink.gmane.org/gmane.linux.network/319839 http://lists.freedesktop.org/archives/modemmanager-devel/2014-June/001213.html (I am experiencing exactly the same problems).
FWIW, additional details are given in a threads permalink. gmane.org/ gmane.linux. network/ 319839 lists.freedeskt op.org/ archives/ modemmanager- devel/2014- June/001213. html
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(I am experiencing exactly the same problems).