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How to Test Your Copper Phone Line (NID) You can isolate your phone problem to your inside or outside wiring by testing your Network Interface Device (NID).
An NID is a small Verizon box generally located on the wall outside the premises. Some older devices may look different from the pictures below. However, you should be able to follow the same procedures.
You will need a screwdriver, a telephone to connect to the NID, a flashlight, and a copy of this procedure.
Note Although the lines are grounded, do not open the NID or test the lines during rain, a thunderstorm, other hazardous weather conditions, or if there is water pooled on the ground near the NID.
Click the picture for an enlarged view and detailed instructions.
See also: Related Troubleshooting Procedures topics