I use a GSM internet plan for accessing internet from my laptop. They allow only one application to use internet at a time. I think they track the application with their user agent. So installing a proxy on my laptop and modifies all user agent to a single one may solve my problem.
So please suggest me a good proxy software for the problem. I tried CNTLM, but it didnt modify the user agent, eventhough it has an option for that.