I upgrade the network-manager and modemmanager:
# dpkg -l | grep network-manager
ii  network-manager                        
0.8~a~git.20090930t162132.866d48b-0ubuntu1~nmt1 network management framework 
daemon
ii  network-manager-gnome                  
0.8~a~git.20091002t194214.8515a07-0ubuntu1~nmt1 network management framework 
(GNOME frontend

# dpkg -l | grep modemmanager
ii  modemmanager                           
0.2.git.20090923t083842.f2a3825-0ubuntu2~nmt1   D-Bus service for managing 
modems

But the problem still exist. My USB stick model numbert is: GI0225 and
SNR: DR2988W61Z

I can connect to internet and it is working fine, but when I disconnect
and pull out the usb device my system freez. I must press and hold my
power button to turn off my computer. What kind info do you need?

-- 
[cdc_acm] Mobile Broadband when modem removed system freezes
https://bugs.launchpad.net/bugs/412605
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