I've installed usb-modeswitch 2.0.1 (from source) to make some tests.

After a fresh install of usb-modeswitch 2.0.1 when I plug/unplug/plug
the 3g Modem, it is correctly recognized and booted up, and i can see it
on Network Manager and connect to 3G.

When I reboot my OS it stops working.

I've done some tests and saved the log of all steps (syslog and
usb_modeswitch log).

Steps:
1) No modeswitch installed
2) usb-modeswitch 2.0.1 installed and modem plugged in
3) connected to 3G network (working fine)
4) disconnected from 3G network
5) unplugged the modem
6) plugged in the modem again
7) connected (again) to 3G network (working fine)
8) disconnected from 3G network
9) rebooted the OS (with the modem unplugged)
10) plugged in the modem after reboot (modem does not become available on 
Network Manager)
11)  unplugged the modem

I'm sending tar.gz with logs from each step. There log files are two for each 
tar.gz:
a) syslog (diff from preceding step);
b) usb_modeswitch log (when installing from source I changed the EnnableLoggin 
flag to true).

I hope this could help.

If there are other files and logs and tests i can do to help on the
debug just ask me for that. =)

** Attachment added: "Files inside explained on the commment."
   
https://bugs.launchpad.net/ubuntu/+source/usb-modeswitch/+bug/1242209/+attachment/3885008/+files/stepped_debug.tar.gz

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https://bugs.launchpad.net/bugs/1242209

Title:
  usb_modeswitch_[6077]: segfault at 8 ip 00007f1e2bc8cc41 sp
  00007ffff9579048 error 4 in libc-2.17.so[7f1e2bc03000+1bd000]

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