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My modem isn't in the device list of usb_modeswitch so I cannot automatically use the modem in Ubuntu.

I found the way to change the modem from USB Storage Mode to Modem Mode and I can use my modem. But I forgot the instructions.

My modem information:

vendor/product id: 05 Qualcomm, Inc. Mass Storage Device

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I don't have much experience with those 3g modems, I've set mine up a while ago and forgot about it as well. I do remember however that in some cases all I needed was ejecting the virtual CD device provided by the dongle using the eject -r /dev/<device> command.

If you don't know your CDROM device's name you could try finding it by plugging in your modem and running:

dmesg | egrep -i 'dvd|cd'
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how to know which device to eject.... – user98698 Dec 5 '12 at 5:17
I updated my answer. – Marcin Kaminski Dec 6 '12 at 20:30

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