We have dealt with this a few times in the past. If you cannect to one of the few ISP's for whom we still have the Geographical number in the database, then you need to set up a PAYG account with them. See the thread Land lines for ISPs for details.

A bluetooth connection between phone & laptop is better than the Infra-red one. I seem to recall reading somewhere that the speed was much higher. You will still be restricted by your phone's modem which could be as low as 9600bps, but on more recent phones has increased to 14.4kbps, so if you're thinking of doing serious browsing, FORGET IT !!

Give us some more details if you want any further assistance as someone else has undoubtedly tried this before & will share their findings with you.