Quantum Fiber Review (2026)
Quantum Fiber is the consumer fiber internet brand of Lumen Technologies, the company formerly known as CenturyLink (and before that, Century Telephone). The rebranding from CenturyLink to Quantum Fiber in 2022 wasn't just a name change — it reflected a genuine shift toward fiber investment and away from the company's aging DSL network.
### The CenturyLink to Quantum Fiber Transition
CenturyLink was, for decades, associated with slow DSL internet and poor customer service in the regions it served (primarily smaller cities, suburbs, and rural areas). The Quantum Fiber rebrand signaled the company's commitment to fiber-to-the-home build-outs in markets where it operates.
The transition is still ongoing. In some addresses, Quantum Fiber (FTTH) is fully available. In others, legacy CenturyLink DSL is the current offering while fiber construction is planned. And in some rural areas, DSL will remain for the foreseeable future.
**Key rule: Always confirm you're getting fiber, not DSL.** The product branding and pricing can look similar, but the performance difference is enormous.
### Where Is Quantum Fiber Available?
Quantum Fiber operates in approximately 16 states with significant presence in:
- **Colorado:** Denver metro, Colorado Springs, Boulder - **Arizona:** Phoenix metro areas - **Nevada:** Las Vegas metro - **Washington:** Seattle suburbs, Spokane - **Oregon:** Portland area - **Minnesota:** Minneapolis suburbs - **Wisconsin:** Milwaukee area, Madison - **Missouri:** Kansas City, St. Louis - **Iowa:** Des Moines, Cedar Rapids - **Nebraska:** Omaha suburbs - **Utah:** Salt Lake City metro - **Idaho:** Boise metro - **Louisiana:** Various markets - **Alabama:** Huntsville, Birmingham
### Quantum Fiber Speed Plans
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Check My AddressQuantum Fiber offers symmetrical speeds on all fiber plans:
- **200 Mbps** symmetric: ~$30–$35/month - **500 Mbps** symmetric: ~$45–$50/month - **940 Mbps** symmetric: ~$60–$65/month - **2 Gbps** symmetric: ~$80/month (select markets) - **8 Gbps** symmetric: ~$150/month (very limited availability)
**No data caps. No annual contracts.** These two features, consistent across all plans, are significant advantages.
### What Quantum Fiber Does Well
**Price-to-performance ratio.** A symmetric gigabit connection for $60–65/month is genuinely competitive. AT&T Fiber charges around $80/month for comparable service in overlapping markets.
**No contracts.** Month-to-month by default.
**No data caps.** No usage limits whatsoever.
**Improving reliability.** Post-rebranding network investments have improved reliability reports in most markets.
### Quantum Fiber Weaknesses
**Legacy reputation.** Long-term CenturyLink customers remember poor DSL service and difficult customer support. The fiber product is genuinely better, but perceptions persist.
**Inconsistent coverage.** Even within Quantum Fiber markets, DSL zones exist alongside fiber zones. Address-level availability must be confirmed.
**Customer service.** Still below average for customer satisfaction, though improved from CenturyLink lows.
**Equipment:** The Quantum Fiber gateway is functional but not as feature-rich as some competitors' equipment.
### Quantum Fiber vs. Competitors
In Denver and Phoenix — its two largest markets — Quantum Fiber directly competes with Xfinity and Cox respectively. In both cases, Quantum Fiber's symmetric speeds and no-cap policy give it a technical edge. The pricing advantage over Xfinity/Cox makes it genuinely compelling where available.
Use [FiberFinder's address lookup](/availability) to see every provider available at your specific address.