First, you need to have BlackBerry Desktop Manager, connect your BlackBerry to your laptop and go to IP Modem menu.
Select your connection profile, in my case my provider is Celcom and I just choose that option.
Connection setting profile will be default to Celcom (depending on your provider).
Click connect to start the connection.
Please be carefull about the charges and hopefully you know what
are you doing.
Now you can access Internet using your laptop with your BlackBerry.
Till then..happy surfing..