I am using Ubuntu 12.04.
When I plug My USB Mobile Broadband Modem, it is detected as a storage disk. It does not switch its mode to Modem. The modem is Micromax MMX310G 3G.
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sakis3gscript from following site http://www.snowguide.gr/gnu-linux-corner/raspberry-pi-raspbian/117-sakis3g-script
chmod a+x ./sakis3gand enter .
./sakis3gand enter .
You are done.
Few things: When you starting your computer and connecting modem for the first time after starting computer you have to go through 5 to 12 .But after that if you disconnect your modem and connect it again it will automatically show your modem.