I think that BSDfan666 described already the problem.
Huawei should be recognized as a uhmodem. Do you have a GENERIC kernel?
I should warn you also that even you can make it work, it's very irritating. For my it works only when ACPI is disabled and when i plug it in while loading the system, otherwise system panics.
There was a lot of bug reports but don't know if there was a fix. Try maybe with the latest current release.
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