Hi Kaushal, the latest version would be available in source form on the draisberghof.de website, and installs easily. Otherwise, you can also use apt-get or synaptic to get it from the repos.
We are currently busy in making the modems work on a hacked copy of android honeycomb with outdated kernels, so I can't offer much help with matching the output with my ubuntu desk to. However, I have usually seen that waiting a few minutes for the mode to flip with network manager usually helps. If your problem persists, the forums on draisberghof.de are a good place to seek help, and there are many other users who have reported similar problems in the past.