I am seeing the same problem with Huawei EC 1260 with Karmic + Beta +
Latest updates. This is happening after upgrading Kernel from
"2.6.31-11-generic #36" To " 2.6.31-14-generic #48".

Observation:
It was working fine with " 2.6.31-11-generic #36" kernel + Network Mangaer + 
Modem Manager. There was some random crash from Modem Manager. I have already 
filed bug against it [0]. But after upgrading to " 2.6.31-14-generic #48". It's 
detect Huawei EC 1260 as usb-storage. Now NM is not dialling modem at all, I 
can see disconnect in available list of connection but it's not working at all. 
But i am able to dial modem with wvdial without any problem.

[0] https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/452489

My triage shows that this is happening because there was fix from
upstream kernel update [1] to 2.6.31-12.39 Kernel Source Tree. That fix
was for "* USB: usb-storage fails to attach to Huawei Datacard cdrom
device." I think that is the problem behind the crash.

[1]
http://changelogs.ubuntu.com/changelogs/pool/main/l/linux/linux_2.6.31-14.48/changelog

-- 
ZTE MF636 3G modem cannot used in Karmic
https://bugs.launchpad.net/bugs/408555
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