Next I unplug modem, restart modem-manager, and plugin modem.
The modem successfully connected to network.

It is really strange why it sometimes connect, and sometimes not.
Log is in "huaweie220_connection_successfull_after_replug.log" file.

** Attachment added: "huaweie220_connection_successfull_after_replug.log"
   
https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/868034/+attachment/2695118/+files/huaweie220_connection_successfull_after_replug.log

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https://bugs.launchpad.net/bugs/868034

Title:
  Huawei E220 and E1550 can't connect on Ubuntu 11.10

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