[ubuntu] 3G Modem, Change Idle Timeout?

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http://ubuntuforums.org – I'm running a Virgin Mobile 3G USB modem in 10.10, and have had no problems setting it up. Kudos devs, for the easy set-up. One problem I do have is that the modem times out when idle for 10 minutes or so, and after it disconnects, it won't dial out and I have to unplug the device and then replug it in to get it to respond. So anyone know how to adjust the timeout? I would like to set it for "0" (no idle timeout at all) but am not sure where the option is. Thanks in advance. (HowTos)