Windows XP
1. Click the START button.
2. If you have 1 column go to SETTINGS then NETWORK CONNECTIONS
* If you have 2 columns find CONTROL PANEL. Once open click *Switch to classic view* on the left. Then find NETWORK CONNECTIONS.
3. Find your dialer probably labeled GWI. Right-click on it and go to properties.
4. Change the number in the telephone number field with NO DASHES.

5. Click OK.
Done!
Windows Vista
1. Click the start button.
2. Select "connect to"
3. Right click on your GWI dial-up connection icon and select "Properties".
4. Locate the "Phone Number" field and enter the new phone number with no spaces or dashes.

When finished click "OK" at the bottom