Since this modem is supported by the kernel since 2.6.20, and it's no
longer working but used to, I would try a few things. First, grab an iso
of a daily cd of quantal and see if your modem works running the live
session via booting from the cd. If so, then the newer versions of
modem-manager and/or the kernel fix your issue. To try and see if the
kernel fixes the issue, go ahead and try running the 12.10 kernel on
12.04. Instructions are here:

http://www.theorangenotebook.com/2012/06/call-for-testing-1210-kernel-
on-1204.html

If a newer kernel doesn't work, you can try installing the newer version
of modem-manager from quantal.

If the livecd of quantal also fails, we can try using an older kernel
and/or older version of modem-manager. Troubleshoot until you isolate
the problem and then we can raise it to the applicable upstream.

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https://bugs.launchpad.net/bugs/1014054

Title:
  Huawei E220 modem will not connect in Ubuntu 12.04

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