I came across this advice from a posting by madvinegar. Unfortunately when I double click to run after allowing it to execute as a program, nothing happens in the new window that opens.
Posting by mad vinegar shown below
The other method I have found which is very easy and helpful is to install and run "sakis3g" program.
I can give the link to download it so you can do that from another PC that actually has internet connection and then transfer it to the PC that does not have internet connection via a USB stick.
You just download it, right click it > properties > allow executing as a program and then double click it to run it.
You follow a set of easy questions and hopefully at the end you get connected. It has the option to even create a desktop shortcut which you can use to connect/disconnect. I think its much easier than modeswitch. Maybe I should prepare a guide about it at some point.
It is completely separate though from network manager (unlike modeswitch). This is no big deal ofcourse.
The link is here:
http://ubuntuone.com/483w3IX72DN3lOlGFcrxQKI have uploaded it onto my ubuntu one account.