[ubuntu] USB modem not detected everytime

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http://ubuntuforums.org – I got stuck up with a problem in net connection in newly installed Ubuntu 12.04 . I am using Qual-Comm HS-USB modem to connect to internet. It was not detected initially after installation of OS.How ever,it got detected and could connect to Internet after following the steps shown here: http://askubuntu.com/questions/14398...ng-in-12-04But most of the time on starting the system it not detecting the device as a modem. It need to reboot the system,so that it got detected. I dont understand what to do. Any help would be appreciated. thanks (Hardware)