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I'm using BSNL 3G USB Datacard. While using it in Vista/Ubuntu, if I use some voice chat clients like Skype/Gtalk, the person on the other side isn't able to hear my voice. I couldn't understand the problem with my mic while using USB Datacard. Please help me with this.

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Check in System > Preference > Sound > Input tab, deselect mute option.

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