Raspberry Pi with 3G Air Card using Sakis3G

I am involving in a project where I have to connect to the Internet using 3G USB Air Card. install the following packages

sudo apt-get install usb-modeswitch ppp libusb-dev

Sakis3G is a tweaked shell script that helps end user connecting through through 3G/UMTS/GPRS. Get sakis3g source from git

git clone git://github.com/Trixarian/sakis3g-source
cd sakis-source
mkdir build
./compile
sudo cp build/sakis3gz /usr/bin/sakis3g

When I first compiled it failed to compile and I had to install libusb-dev. After successfully compile you need to run as root. In fact after compilation it recommend:

sudo bash || su
to connect use
sakis3g connect
or
sakis3g --interactive connect

My operator requires to put APN but no username and password required. Sakis3g will guide you how to enter APN but if you do not put username it will quit and cannot connect. What I do is I enter a blank space for my username and password then it connects.