Change Dial Up Numbers - Windows 95/98
1. Double click My Computer.
2. Double click Control Panel.
3. Double click Dialup Networking.

4. Right click on the TPG Internet connection. icon and click Properties.

5. Click the Networking tab. Remove the tick next to Use area code and Dialling Properties. Change the number in the Telephone Number field to the new Dial Up Access number you would like to use.

6. Click ok