Installing usb-modeswitch might fix this, although I'm not sure whether
it contains the necessary rules for this modem.

Otherwise, this problem might be fixed upstream in kernel 3.1-rc4.  From
the changelog:

commit 0e69d75ccb2f091757b38d4d6a2ed739e06b615e
Author: Andrew Bird
Date:   Tue Aug 16 13:57:14 2011 -0600

    USB option driver add PID of Huawei Vodafone K3806
    
    This patch adds the product ID of Huawei's Vodafone K3806 mobile broadband
    modem to option.c. This is necessary so that the driver gets loaded on
    demand without the intervention of usb_modeswitch. This has the benefit of
    it becoming available faster and also ensures that the option driver is not
    bound to a network interface that should be claimed by cdc_ether.
    
    Signed-off-by: Andrew Bird
    Signed-off-by: Alex Chiang
    Cc: stable
    Signed-off-by: Greg Kroah-Hartman

A PPA of this kernel is available at 
http://kernel.ubuntu.com/~kernel-ppa/mainline/
This patch has also been cc'd to the stable kernel series.

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https://bugs.launchpad.net/bugs/787166

Title:
  K3806-Z internet key don't work after update to ubuntu 11.04

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