Check your phone for dial tone at the NID box (Network Interface Device) on the side of your house. It is a gray box approximately 9” x 7” x 3” (businesses and multi-tenant buildings have a larger interface). This is the point where your inside wiring meets the Madison Telephone Company network. The interface is usually located on an exterior rear or side wall. In some cases, this interface will be located in your basement or within 12” of an outside wall. Unscrew and open the left side of the box. Find the test jack for each of your lines. If there are multiple lines in your home or business, each line should be tested.