How do i get my laptop to access the internet Via my mobile phone so i can get pay as you go connection.

You will need a digital mobile phone (cell phone to our US cousins) Both will need to be bluetooth enabled or you will need a data cable from phone to laptop

The phone will need to be GPRS enabled

The alternative, easier, though certainly not cheaper method assuming that you have a spare PCMCIA slot, would be to use a datacard such as this one