Quantum Fiber After AT&T: The $50 Gig Is Real

Updated on September 7, 2026

Quantum Fiber internet is now an AT&T service. AT&T completed its $5.75 billion purchase of Lumen’s mass-market fiber business on February 2, 2026, picking up more than 4 million fiber locations and over 1 million subscribers across 11 states — almost all of them in cities AT&T Fiber never reached.

The plans are simple and aggressively priced: on a live Denver address quote we ran September 5, 2026, Quantum Fiber internet costs $50/mo for 500 Mbps, the same $50/mo for 940 Mbps, and $70/mo for 2 Gig — symmetrical fiber with whole-home Wi-Fi included, free installation, no contract, and unlimited data. Here is the full picture, including the billing quirks the plan cards don’t mention.

Quantum Fiber plans and prices (verified September 2026)

*Prices reflect the $5/mo discount for paying by linked bank account (ACH); FCC broadband labels list base rates of $55 / $55 / $75. These are not introductory rates and there is no contract. Billing is prepaid (you pay each month in advance), taxes are additional, early termination fee is N/A, and equipment plus professional installation are $0 on every tier. Verified on a live Denver, CO address quote, September 5, 2026. Availability and lineup vary by address.

The $50 gig: don’t order the 500 Meg plan

The strangest thing on the Denver quote is the best deal in fiber right now: 500 Mbps and 940 Mbps are both $50/mo at the same address, with the same included equipment and the same $0 install. The 940 tier even posts better FCC label numbers — 944 Mbps typical download at 3.0ms latency versus 527 Mbps at 5.2ms. Unless the slower tier is literally all your address can get, ordering 500 Meg means paying gig money for half a gig. And the 2 Gig plan over-delivers: its label shows 2,103 Mbps typical download — more than the marketed speed — for $20 more.

Who owns Quantum Fiber now?

AT&T owns Quantum Fiber. The company closed its $5.75 billion acquisition of Lumen’s Mass Markets fiber business on February 2, 2026, and the brand now runs as “Quantum Fiber from AT&T.” The deal handed AT&T more than 4 million fiber locations and over 1 million fiber subscribers concentrated in metros like Denver, Phoenix, Seattle, Minneapolis and Salt Lake City — an 11-state footprint that sits almost entirely outside AT&T’s own legacy wireline territory.

That is the whole point: AT&T bought instant fiber presence in cities it could never economically overbuild. We covered the deal itself in our AT&T–Quantum Fiber merger explainer; this page is about what the service actually costs and delivers today.

Is my CenturyLink internet part of AT&T now?

Only if it’s fiber. The acquisition moved Lumen’s fiber-to-the-home business — the Quantum Fiber internet product — to AT&T. CenturyLink’s copper and DSL customers stayed with Lumen and still get service under the CenturyLink name. The quick test: if your service is symmetrical (uploads as fast as downloads) and billed through the Quantum Fiber app or portal, you are an AT&T customer now.

If you’re on older CenturyLink DSL, nothing about your provider changed — though it’s worth checking whether Quantum Fiber internet has since been built to your address, because the jump from DSL to a $50 gig is the single biggest upgrade in broadband.

Quantum Fiber vs. AT&T Fiber: one company, two networks

AT&T now sells fiber under two brands that barely overlap on a map. AT&T Fiber covers its legacy 21-state wireline region (Dallas, Atlanta, Los Angeles, Miami); Quantum Fiber covers the old CenturyLink strongholds (Denver, Phoenix, Seattle, Minneapolis–St. Paul, Salt Lake City, Las Vegas, Portland, Omaha, central Florida). You will almost never choose between them — your address decides.

The bridge between the brands is wireless: pair Quantum Fiber internet with AT&T Wireless and AT&T takes $40/mo off your wireless bill for the first year — the “$480/year” banner — the same convergence play we’ve tracked with Verizon Fios and Frontier after their merger. One honest caveat from the Denver broadband labels: that discount lands on the wireless bill, not the fiber bill, and the labels show no billing discount on the broadband service itself for bundling.

The fine print worth knowing

Quantum Fiber’s billing model is unusual, in mostly good ways. Service is prepaid — you pay each month in advance — and the advertised prices assume you pay from a linked bank account; card payers give back the $5/mo discount. Taxes are additional (unlike Frontier’s all-in pricing), but everything else really is $0: the 360 WiFi router, mesh pods, professional installation, and there’s no contract and no early termination fee, so “cancel anytime” is real.

One more thing our Denver pull surfaced: the new-order ladder tops out at 2 Gig — even in Denver, one of the metros where Lumen once sold 3 Gig and 8 Gig XGS-PON tiers. If you need more than 2 Gig at a Quantum address today, it isn’t on the menu; the good news is the 2 Gig tier’s measured performance runs past its marketed speed.

Where Quantum Fiber is available

The footprint spans 11 states with more than 4 million serviceable locations, centered on the metros above plus Boise, Spokane, Tucson, Colorado Springs and Orlando’s suburbs. AT&T says it plans to push fiber penetration in the acquired footprint from roughly 25% toward AT&T Fiber levels on its way to 60 million total fiber locations by 2030, so buildout should accelerate rather than stall. The only way to know your address qualifies — and which tiers it gets — is to run the address check.

How Quantum Fiber internet stacks up against cable

In most of its footprint, Quantum Fiber internet competes head-on with Xfinity or Spectrum cable — and the comparison is lopsided at the gig tier. Cable gig plans in these metros typically run $70–$90 after the promo year, charge upload speeds a tenth of their downloads, and lean on equipment fees; the $50 Quantum 940 tier is symmetrical, includes the router and pods, and its price is not a promo that expires.

Cable still wins on one axis — availability — because fiber passes only part of each metro. If your address gets both, fiber’s upload speed alone settles it for anyone who works from home, backs up to the cloud, or uploads video.

How we verified this: we ran a live availability and checkout quote for a residential Denver, CO address (ZIP 80205) on September 5, 2026, and read each tier’s FCC Broadband Facts label — the legally mandated disclosure of base price, typical measured speeds, and every fee. Lineups and promos vary by address, so treat our numbers as a verified snapshot, and your own address check as the final word.

Quantum Fiber internet FAQ

Keep going

• ALLO fiber — the no-promo fiber rival in Quantum’s Colorado and Arizona towns
• Brightspeed internet — the other half of the old CenturyLink map — fiber from $29.99, DSL where the build has not landed
• AT&T Internet Air — AT&T’s fixed-wireless fallback outside the fiber footprint
• AT&T buys Quantum Fiber: what the merger means for customers
• Verizon Fios review: plans, prices and the Frontier merger
• Frontier internet: fiber plans up to 7 Gig, verified
• Google Fiber’s upgraded lineup: faster speeds, same prices
• Best internet price-lock plans
• T-Mobile Home Internet review
• Cable internet alternatives worth switching to