Comment 4 for bug 1210119

I got the solution(Only if you have a laptop or neighbor's wi-fi password)

copy the .deb package and try installing by

sudo dpkg -i <package>.deb

it will install but still not run... Go to the /opt/ folder and there you will find the <3GModem>folder

cd /opt/3GModem & ls

Here you will find the ModemClient script file..run it
./ModemClient

It will show some missing dependencies, install them via another internet connection (Go to the nearby cafe or borrow someone's Ethernet)

sudo apt-get install <required dependencies>

It will run but connection might fail due to root privileges so open another terminal and type
"sudo /opt/3GModem/ModemClient"

It worked on my laptop and so should yours by the way i am using 13.10 ubuntu version