Under here double click on "Modems".

Click on "Dialing Properties".

Put a check mark in the box next to "To disable call waiting, dial:" and select "*70" to disable it. Make sure you have "918" in for the area code. Then click "OK" until you are back to the "Control Panel". Double click on "Internet Options".

Click on the "Connections" tab then click on the "Settings" button.

Click on "Properties".

Make sure there is a check mark next to "Use area code and Dialing Properties". If not put one there and then just click "OK" until you are back to the "Control Panel" and then close out of it and when you connect next time it should disable your call waiting. Also you need to make sure you have "Cancel Call Waiting" through your telephone company.