How do I fix a home phone with no dial tone through a cable box?
Answer
Restart the cable phone box, then plug one working corded phone directly into the TEL or PHONE port on the box. If that phone still has no dial tone, the problem is usually the box or provider line rather than the wall jacks.
Before you start: stop right away if…
- Stop if a site or caller asks you to pay an unexpected fee to restore dial tone.
- Unplug only the power and phone test cords described here; do not open the cable box.
Follow these steps
Restart the cable phone box
Unplug the cable box or phone adapter power cord for 60 seconds, plug it back in, and wait 5 to 10 minutes for it to finish restarting.
You should see: The box finishes booting and any phone or online lights return to their normal state.
Test a phone directly on the box
Plug a corded phone directly into the TEL or PHONE port on the box, not into a wall jack. Pick up the handset and listen for dial tone.
You should see: You either hear dial tone from the box, or you confirm the box itself has no phone service.
Compare with wall-jack phones
If the direct-connected phone works, plug phones back into wall jacks one at a time. If wall phones stay dead while the direct phone works, focus on house phone wiring or a bad jack.
You should see: You know whether the failure is limited to wall wiring or affects the box service itself.
Check other phones and cords
Try a second phone and a different phone cord on the box port. Replace any cracked cord before assuming the service is down.
You should see: A known-good phone and cord either restore dial tone or show the same failure.
Contact the phone provider if the box has no tone
If a good phone plugged straight into the box still has no dial tone after the restart, contact your cable or phone provider and report that the phone adapter has no dial tone on the TEL/PHONE port.
You should see: The provider can run a line test or schedule service for the phone adapter.
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Extra tips
What to look for: No dial tone on pickup, whether every phone in the home is dead, and whether the cable phone box has power and phone-port lights.
Before you change anything: Have one simple corded phone ready for testing. Know where the cable modem or phone adapter box is. Do not cut or rearrange coax or phone wiring beyond unplugging and reseating connectors. Avoid paying anyone who cold-calls about “line reactivation” fees.