Is it possible to use an unlocked treo 680 to make a phone call and connect to an ISP in order to navigate on the internet ?

I have a treo 680 and will like to call a local internet dial up to connect to surf the internet, download my mail and so on using the Blazer web program that comes with the treo.

Can this be done ? Do I need a special software to do this ?
How can I configure the treo to do so ?

Any help will be greatly appreciated.

Livianin