I have just upgraded the firmware in my E220. It was already at
11.110.05.00.00 (the one from Vodafone) so I took it to 11.117.09.04.00.

Under 10.04.1 the behaviour is now decidedly odd.

When I plug it in lights flash and the CD part of it shows up. There is
no sign of the modem side, though, and network manager does not give any
mobile broadband connection options.

If I then plug in a spare ZTE MF627 dongle, mobile broadband appears as
an option, and I can connect happily through the E220. After a while
network manager offers connections through either device (not at first,
though, when only the E220 is used), then it offers a choice. As soon as
mobile broadband becomes an option I can remove the ZTE MF627 without
causing problems, but it needs to be reinserted if the E220 is
disconnected for any reason.

That's all on a fresh 10.04.1 install. usb_modeswitch is not installed,
as I understand it should no longer be necessary.

-- 
Huawei E220 modem unable to connect under Karmic
https://bugs.launchpad.net/bugs/449394
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