After running modem-manager in debugging mode, I saw the real error: the SIM- card was not properly inserted.
The main problem, in my case, seems to have been the misleading error message. It would have been really helpful if it had simply said it could not find the SIM-card. Kind regards, Frodo Looijaard -- Frodo Looijaard <fr...@frodo.looijaard.name> (See http://frodo.looijaard.name/) Defenestration n. (formal or joc.): The act of removing Windows from your computer in disgust, usually followed by the installation of Linux or some other Unix-like operating system. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org