Hi Marius Kotsbak,
yes my SIM and modem are working well, SIM PIN check is always disabled, my 
modem  MF636 does NOT blink in red. I did not ever noticed a red led (I am not 
sure if exists), possibly we have slightly different h/w versions (that is why 
I mentioned my IMEI# in comment #68).

At this test I did not manage to 'use' the modem. Never shown at network
manager icon but /dev/ttyUSB0-1-2 were created. Looking at
/var/log/daemon.log I show trials to /dev/ttyUSB1! A ZTE modem canNOT be
used via /dev/ttyUSB1, the usable data port is the last created, in our
case /dev/ttyUSB2.

When the system cannot connect via nm & mm (as above) I can connect ALL TIMES 
using:
sudo stop network-manager
sudo killall modem-manager
sudo wvdial (or pppd ...)
as described in many comments above and 
http://ubuntuforums.org/showthread.php?t=1202430)

Concluding: It is not a modem's problem (PIN, signal, etc) but possibly a f/w 
or h/w variation.
My opinion is that the problem is around modem-manager or a timing-problem 
using the LiveUSB.

I can be online for 2-3 hours more for any new test (more tests
tomorrow).

Regards,
George

** Attachment added: "daemon.log"
   http://launchpadlibrarian.net/43587982/daemon.log

-- 
ZTE MF636 3G modem cannot used in Karmic
https://bugs.launchpad.net/bugs/408555
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