How to use GPRS (not wifi or 3G) to get internet access?

With my Galaxy 5, I can visit websites using wifi, but how can I access them using GPRS (=when no wifi around)? I don't want to pay for a 3G data plan with my mobile operator. **Background**: On my old Nokia phone (which didn't have wifi), I was able to visit a website using GPRS (useful only for emergencies, but still, useful). This meant that I did not have to subscribe to some data plan with my mobile operator (at least in my country this is so); I did have to pay for the GPRS connection, but that was only when connected.