I have installed ubuntu 13.10, and have difficulty in mobile boradband. I have a Tata Photon usb stick, configured as Huawei EC 1260. It shows up in lsusb as 12d1:140b, but does not show up as device when I try to add a mobile broadband connection. It also does not appear in network manager icon.
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Your dongle is supposed to switch into modem mode automatically but it doesn't. The problem is similar to mine: Huawei e173s 3G USB dongle won't switch into modem mode - except that the device is different, and so may be the exact cause.
The program which does auto-switching is usb_modeswitch. The first thing you should do is to enable usb_modeswitch logging: http://www.draisberghof.de/usb_modeswitch/#trouble (that section also suggests some common problems/solutions).
After looking at the log file, you will be able to localize the problem and cross-check with forum threads such as this: http://www.draisberghof.de/usb_modeswitch/bb/viewtopic.php?t=681
Unfortunately, I can't give you an exact answer to the problem as causes may vary depending on device type / firmware version / kernel version; but above should constitute a reasonable troubleshooting guide. You can follow the steps and write back.
