If one (or more) of your phones does not work, check all other phones on the same line to see whether any of them work and to isolate the location of the problem. One at a time, unplug each phone in the house from its module and then test to see whether any of the other phones work. If you find that unplugging one of the phones from its module makes all of the other phones work, the problem is with that phone or--most likely--its cord or module. Try replacing the phone cord with a working cord to see whether that makes a difference. If it doesn't, open up the receptacle module and see whether any of the wires inside have become disconnected.

Note: There are often unused wires inside a phone module; these are not meant to be connected. You can usually tell these from working wires because their ends are not stripped of insulation.

If you can't isolate the problem or get any of the phones to work by exchanging phones and cords, report the problem to your phone company from a neighbor's house or another phone.