Quantum Fiber provides fiber internet service for homes and small businesses in select U.S. markets. If you need Quantum Fiber customer service for billing, outages, account login, app help, installation, equipment, reviews, or complaints, use the support options below to reach the correct contact route.

Quantum Fiber Customer Service Phone Number

Quantum Fiber Customer Support: 1-833-250-6306
Phone Support Hours: 7 days a week, 7 a.m. to 11 p.m. CST
Chat Support: Available through the official Quantum Fiber contact page

App Support: Available through the Quantum Fiber app

Best Ways to Contact Quantum Fiber

The best Quantum Fiber support route depends on whether you need help with billing, an outage, installation, speed problems, account login, moving service, or canceling service.

Billing, account, or payment issue: Sign in to your Quantum Fiber account or call 1-833-250-6306.
Internet outage: Use the outage checker, sign in to your account, check the Quantum Fiber app, or call support.

Technical support: Use chat, the Quantum Fiber app, or call customer service.
Appointment changes: Cancel or reschedule appointments through the app or web account tools.
Moving or upgrading service: Contact Quantum Fiber support before your move or service change.

Canceling service: Quantum Fiber says customers should contact support to cancel.

You can also visit the official Quantum Fiber Contact Us page, the Quantum Fiber Support Center, the Quantum Fiber sign-in page, or the Quantum Fiber outage support page.

Quantum Fiber, Lumen, and AT&T

Quantum Fiber was previously associated with Lumen Technologies. AT&T completed its acquisition of substantially all of Lumen’s Mass Markets fiber business in 2026. Because of this transition, some older online listings may still refer to Lumen, CenturyLink, or Quantum Fiber by AT&T.

For customer service, use the current Quantum Fiber support page, app, chat, or phone number listed above. For broader corporate information, see the related AT&T Corporate Office Headquarters page on CorporateOfficeHeadquarters.com.

Before You Contact Quantum Fiber Support

Having the right information ready can help Quantum Fiber identify your account and troubleshoot the issue faster.

Your Quantum Fiber account number, if available
The service address connected to the account
The email address or phone number on the account
The type of issue: billing, outage, speed, Wi-Fi, equipment, installation, moving, or cancellation

Any SmartNID, modem, router, or 360 WiFi pod error messages
Dates and times of outages, slow speeds, missed appointments, or prior support contacts
A copy of the bill, payment confirmation, or disputed charge if calling about billing

Common Reasons Customers Contact Quantum Fiber

Internet outage or service interruption
Slow fiber internet speeds or Wi-Fi coverage problems
SmartNID, modem, router, or 360 WiFi pod troubleshooting
Billing questions, payment method updates, or account access
Installation appointments, late technicians, or rescheduling
Moving service to a new address
Pausing, canceling, or upgrading service
Equipment return questions
Account login, password reset, or app support
Business fiber availability or service questions

Quantum Fiber Internet Outage Support

If your Quantum Fiber internet is out, check whether the problem affects every device in your home or only one device. If multiple devices are offline, use the Quantum Fiber outage checker or sign in to your account to see whether there is a known outage at your address.

Quantum Fiber says outage alerts may appear in the app or online account, and customers can turn on service notifications to receive updates. If no outage is listed, the issue may involve equipment, Wi-Fi pods, a SmartNID or modem, power, wiring, or a device-specific problem.

Speed, Wi-Fi, and Equipment Troubleshooting

For slow internet, test both Wi-Fi and a wired connection if possible. A wired speed test can help determine whether the issue is the fiber connection itself or the Wi-Fi signal inside the home. Note the speed-test results, time of day, device used, and whether the issue happens in one room or throughout the home.

If you use Quantum Fiber 360 WiFi, check whether the pods are powered on, connected, and placed correctly. Do not factory-reset equipment unless Quantum Fiber support instructs you to do so.

Billing, Payments, and Account Help

For billing questions, sign in to your Quantum Fiber account to review payment methods, account details, and recent charges. If your bill changed, compare your current statement with the previous statement before contacting support.

Billing changes may involve taxes and fees, service upgrades, equipment, installation charges, payment method issues, account changes, or a transition from older Lumen or CenturyLink systems. Use the official Quantum Fiber account portal or app rather than links from unsolicited texts, emails, or social media messages.

Moving, Upgrading, Pausing, or Canceling Service

If you are moving, contact Quantum Fiber before your move date to check service availability at the new address and confirm whether new installation, equipment changes, or a new account setup is required.

If you are canceling service, ask support to confirm the cancellation date, final bill, equipment return instructions, and confirmation number. Keep return receipts, tracking numbers, email confirmations, and photos of returned equipment in case a billing dispute comes up later.

Quantum Fiber Reviews and Complaints

CustomerServiceNumbers.com currently shows 0 Quantum Fiber reviews and complaints. If you have contacted Quantum Fiber customer service, you can leave a review below to help other customers understand what to expect when calling about internet outages, billing, installation, app support, equipment, cancellations, or account issues.

Because there are no visible Quantum Fiber reviews yet on this page, CustomerServiceNumbers.com is not summarizing customer sentiment at this time. New reviews may help identify common praise, complaints, support delays, billing issues, outage problems, installation concerns, or successful resolutions.

Safety and Privacy Tips

Do not post your Quantum Fiber account number, service address, phone number, password, payment information, confirmation code, or other private account details in a public review or comment. If someone contacts you claiming to be from Quantum Fiber, Lumen, CenturyLink, or AT&T and asks for payment by gift card, cryptocurrency, wire transfer, or a suspicious link, verify the request through the official Quantum Fiber website or customer service number.

Reviews and comments may be moderated for profanity, spam, and personally identifiable information. Keep your review focused on your customer service experience and avoid sharing private account details.

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Disclaimer

CustomerServiceNumbers.com is not affiliated with Quantum Fiber, AT&T, Lumen Technologies, or CenturyLink. Contact information is provided for informational purposes and may change. Always verify account-specific support options through the official Quantum Fiber website before sharing private information or making payments.

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Quantum Fiber Customer Service, Reviews and Complaints