Frontier Communications offers both DSL and fiber internet. They also acquired many former Verizon Fios territories. Your setup depends on whether you have DSL (phone line) or fiber (ONT box). Here's how to fix every common issue.
Fix 1: Check for Frontier Outage
- Visit frontier.com/helpcenter or use My Frontier app
- Check downdetector.com/status/frontier
- Call 1-800-921-8101
- If outage confirmed, wait for restoration
Fix 2: Restart Router and ONT
For Frontier Fiber:
- Unplug ONT power (and battery backup if present)
- Unplug router power
- Wait 60 seconds
- Plug in ONT first → wait 3-5 minutes → solid green lights
- Plug in router → wait 3-5 minutes
For Frontier DSL:
- Unplug modem power
- Wait 60 seconds
- Plug back in → wait 5-10 minutes for DSL sync
Fix 3: Check ONT Lights (Fiber)
| Light | State | Meaning |
|---|---|---|
| Power | Solid Green | ONT has power |
| PON/Network | Solid Green | Connected to Frontier fiber |
| PON/Network | Off / Red | No fiber signal — call Frontier |
| Internet/Data | Solid/Blinking | Data flowing normally |
Fix 4: Check Ethernet Cable (ONT to Router)
- The Ethernet cable from ONT to router WAN port must be solid
- Try a different Ethernet cable
- Plug into the correct port — ONT's Ethernet port to router's WAN/Internet port
Fix 5: Check DSL Line (DSL Customers)
- Install DSL filters on all phone jacks with phones
- Modem jack should NOT have a filter
- Try connecting to a different phone jack
- Test at the NID test jack outside the house
Fix 6: Test Direct Connection
- Connect computer directly to ONT or modem via Ethernet
- If internet works → router issue
- If no internet → ONT/modem or Frontier line issue
Fix 7: Request Equipment Replacement
If your Frontier equipment is old (5+ years especially for former Verizon areas), call 1-800-921-8101 to request updated equipment. Frontier Fiber customers can request the latest WiFi 6 router.
Frequently Asked Questions
Why is my Frontier internet not working?
Common causes: (1) Frontier outage in your area, (2) Router/ONT needs restart, (3) DSL sync lost, (4) Fiber ONT power loss, (5) Account issue, (6) Old equipment. Frontier recently acquired Verizon Fios areas, so equipment may vary.
Does Frontier use DSL or fiber?
Both — it depends on your area. Frontier Fiber (formerly Fios in some regions) uses fiber optic with an ONT. Frontier DSL uses phone lines with a DSL modem. Fiber is faster and more reliable. Check your bill or call Frontier to confirm which type you have.
How do I restart my Frontier router?
Unplug power → wait 30-60 seconds → plug back in → wait 10 minutes. For Frontier Fiber, also restart the ONT by unplugging its power for 30 seconds. If you have a battery backup on the ONT, disconnect the battery too.
My Frontier router shows a red light — what does it mean?
Red light on Frontier routers usually means no internet connection. Try restarting. If the red light returns, check the Ethernet cable from ONT to router (fiber) or the DSL line (DSL). If the issue persists, call Frontier at 1-800-921-8101.
How do I contact Frontier for internet issues?
Call 1-800-921-8101, visit frontier.com/helpcenter, or use the My Frontier app. The app can run diagnostics and schedule technician visits. For new fiber customers, there's also an onboarding support line.
Frontier Still Not Working?
Our technicians can diagnose Frontier DSL and fiber issues remotely.