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Official CenturyLink Customer Support
1-800-244-1111 CenturyLink residential internet & phone
schedule Mon–Fri 8 AM–6 PM MT
verifiedVerified Official blockNo Hidden Fees
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Business / Alternate Line
1-877-453-8353 Quantum Fiber & business services
Support available via: PhoneLive ChatIn-Home Technician
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About Lumen Technologies (CenturyLink / Quantum Fiber)
CenturyLink (now branded Lumen Technologies for enterprise and Quantum Fiber for residential) was founded in 1930 as a rural telephone company in Monroe, LA. Today it's headquartered in Monroe, LA, and operates one of the most extensive fiber and DSL networks in rural and suburban America covering 37 states. Quantum Fiber (the consumer fiber brand) offers symmetrical gigabit speeds in select markets, while legacy DSL service continues in areas awaiting fiber buildout.
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When to Call CenturyLink Support
These situations typically require speaking with a CenturyLink representative directly.
- check_circle Your CenturyLink DSL or Quantum Fiber internet is completely down
- check_circle Your CenturyLink modem shows a red or blinking DSL light
- check_circle You want to upgrade from DSL to Quantum Fiber if it's available in your area
- check_circle You need a technician to service your buried phone line or outside plant
cell_tower CenturyLink Products & Devices Covered
This support number handles service and technical support for the following CenturyLink products.
cell_tower CenturyLink C4000 modem/router
cell_tower CenturyLink C3000Z DSL modem
cell_tower Quantum Fiber ONT (fiber terminal)
cell_tower Quantum Fiber Wi-Fi router
cell_tower CenturyLink home phone service
cell_tower CenturyLink DSL internet plans
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Common CenturyLink Issues
The most-reported CenturyLink problems and what to expect when you call for each.
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DSL internet down or slow
CenturyLink DSL internet not working or much slower than expected
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DSL sync light blinking
Modem DSL light is blinking and won't establish a connection
chevron_right error
Fiber ONT showing trouble light
Quantum Fiber ONT box has a red or blinking status light
chevron_right phone_disabled
Phone line static or no dial tone
Home phone line has static, noise, or no dial tone
chevron_right speed
Slow DSL speeds below advertised
Actual DSL speeds significantly lower than what plan promises
chevron_right tips_and_updates
Fix It Yourself
Try these steps before calling. They resolve the majority of common CenturyLink issues.
1
Restart your CenturyLink modem properly
Unplug your CenturyLink modem from the wall outlet and phone/fiber line. Wait 60 seconds. Plug the phone/fiber line back in first, then the power. The modem needs 3-5 minutes to fully reconnect to CenturyLink's network infrastructure.
2
Check if Quantum Fiber is available at your address
Visit quantumfiber.com and enter your address. If Quantum Fiber is available, it's a significant upgrade from DSL — offering 200 Mbps to 1 Gbps symmetrical speeds vs. typical DSL speeds of 5-40 Mbps depending on your distance from the central office.
3
DSL speeds depend on distance from the phone exchange
CenturyLink DSL speeds decrease the farther you are from the nearest central office (phone exchange). If you're 3+ miles from the exchange, your actual speeds may be 25-40% of the advertised maximum. Fiber is the only solution for consistent high speeds at any distance.
shield Warranty & Coverage
CenturyLink and Quantum Fiber-provided modems and routers are maintained and replaced at no charge during service. Outside line issues (buried cable, pole maintenance) are repaired by CenturyLink technicians at no cost to the customer.
quiz CenturyLink FAQ
Common questions answered by our research team.
add What is the difference between CenturyLink and Quantum Fiber?
CenturyLink is the legacy brand for DSL internet and home phone service. Quantum Fiber is the consumer-facing brand for CenturyLink's fiber internet expansion. As fiber reaches more areas, CenturyLink DSL customers are migrated to Quantum Fiber. Both are operated by Lumen Technologies.
add Is Quantum Fiber available in my area?
Check availability at quantumfiber.com by entering your address. Quantum Fiber is actively expanding but remains unavailable in many rural CenturyLink service areas. Current fiber markets include Phoenix, Denver, Seattle, Salt Lake City, Minneapolis, Las Vegas, and 20+ other cities.
add What speeds does CenturyLink DSL offer?
CenturyLink DSL speeds range from 10-100 Mbps download depending on distance from your central office. Most DSL customers receive 25-50 Mbps download and 5-10 Mbps upload. Quantum Fiber offers symmetrical 200 Mbps to 8 Gbps depending on market.
add Does CenturyLink have a price lock?
Quantum Fiber offers a Price for Life guarantee — your monthly rate won't increase as long as you keep the service. Legacy CenturyLink DSL plans do not include this guarantee and rates can increase with 30 days' notice.
add Can I cancel CenturyLink without a cancellation fee?
CenturyLink and Quantum Fiber typically offer month-to-month internet service with no contract for residential customers. You can cancel anytime without early termination fees. Confirm your specific agreement terms when signing up — promotional pricing may include a 12-month commitment.
business_center CenturyLink Business Support
Lumen Technologies serves enterprise customers with fiber, MPLS, edge computing, and SD-WAN services with dedicated business account management.
phone
Business Line: 1-877-453-8353