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How to Test Your FiOS Phone Line (ONT) If you have determined that the ONT has power, the next step is to complete the ONT test procedure. You will need a flat-head screwdriver, a working telephone to connect to the ONT, a flashlight, and a copy of this procedure.
Note Although the lines are grounded, do not attempt to open the ONT or test the lines during rain, a thunderstorm, or other hazardous weather conditions. If there is a loud hum on the line, do not test the ONT. Contact Verizon at 1-800-VERIZON (1-800-837-4966).
Next Check the battery back-up unit (BBU).
See also: Related Troubleshooting Procedures topics