I am using the following workaround sucessfully on two different 12.04
desktops & one linux Mint R13 laptop to connect with a huawei E220 Modem
on 3G / 2G networks

#Running the following AS ROOT after the first unsuccesfulll connection
attempt  allows the modem to connect without problems until it is
removed from the USB port:

   echo -e "AT+CNMI=2,1,0,2,0\r\nAT\r\n" > /dev/ttyUSB1

Without it I can't get a connection.

   I picked the commad from the C:\Program Files\Mobile
Partner\Log\ATRecord.txt file on a Windows XP VM,  after noticing that
the modem would work properly in ubuntu after connecting first one time
inside the XP VM, until the modem gets unplugged.  Other AT command
combinations don't have the same effect - it needs to be the exact above
sequence.

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

Title:
  Huawei E220 and E1550 can't connect on Ubuntu 11.10/12.04

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