Try This
I too use a nokia (6310i) to access the internet from my laptop via bluetooth and Tiscali.
I recently bought a new laptop and gave my brother my old laptop and created a tiscali account for him to use.
When I set up his account, I noticed that the dial-up phone number has changed!!
I use to use 0844 057 5000
Now they're putting it out as 0844 052 9009
PS. Have you worked out a cheaper way of using this kind of setup?
No-one will allow a mobile to access a contract-ISP account (0800 or 0808), so 0844/0845 is the only way to go as PAYG at 5p/min off-peak and not included in mobile inclusive minutes. I also have lots of unused inclusive minutes each month, but still have to pay 5p/min for internet access.