AT&T Fiber vs Quantum Fiber: Same Owner, Different Plans
Updated
If you live in a former CenturyLink area, you may be wondering whether to pick Quantum Fiber or AT&T Fiber. As of 2026, they belong to the same company. AT&T closed its $5.75 billion purchase of Lumen's mass-markets fiber business on February 2, 2026, and Quantum Fiber came with it. Quantum's website now calls the service "Quantum Fiber from AT&T."
The brands haven't fully merged yet, though. The plans, prices and billing rules still differ. Here's what each one offers on October 2, 2026, and what existing Quantum customers should watch for.
Who owns what now
Lumen, the company formerly known as CenturyLink, built Quantum Fiber as its fiber-to-the-home brand. The AT&T deal covered Lumen's consumer fiber business across 11 states: Arizona, Colorado, Florida, Idaho, Iowa, Minnesota, Nebraska, Nevada, Oregon, Utah and Washington. Lumen kept its older copper DSL lines, so some CenturyLink DSL customers still deal with Lumen rather than AT&T.
AT&T has been moving former Lumen fiber customers to the AT&T Fiber brand one market at a time. Until that reaches your area, you may still see Quantum Fiber pricing, the Quantum app and Quantum billing.
AT&T Fiber vs Quantum Fiber at a glance
| AT&T Fiber | Quantum Fiber | |
|---|---|---|
| Entry offer | 300 Mbps for $35/mo (select markets) | 500 Mbps (priced by address) |
| Gig offer | Priced by address | 1 Gig for $50/mo after discounts |
| Top tier | Up to 5 Gig where available | 2 Gig for $70/mo in select markets |
| Discount rules | AutoPay plus paperless billing | New-customer discount plus $5 bank AutoPay credit; paperless required |
| Billing | Monthly bill | Prepaid month to month |
| Wireless bundle | Savings with eligible AT&T wireless | $20/mo off an eligible AT&T unlimited plan |
| Data caps and contracts | None on fiber | Unlimited data, no annual contract |
Prices exclude taxes and fees and are for new customers.
Quantum Fiber plans and pricing
Quantum's headline offer is 1 Gig for $50 a month. The math is spelled out in its terms: an $80 regular rate, minus a $25 monthly new-customer discount, minus another $5 when you pay by AutoPay from a bank account. Paperless billing is required. In select markets, 2 Gig is $70 using the same discounts off a $100 regular rate. A 500 Mbps tier is also listed, priced by address.
Two details are easy to miss. First, Quantum bills in advance: your first month is charged when the order completes, and service renews monthly until you cancel. Second, some new installs need construction work. Quantum covers the first $1,500 of construction charges and asks you to approve anything above that before work starts. Technician installation is included, and data is unlimited.
Quantum also offers a low-cost plan called Simply Fiber for qualifying households.
AT&T Fiber plans and pricing
AT&T advertises 300 Mbps for $35 a month for new customers in select markets, after AutoPay and paperless billing discounts. Faster plans climb through gigabit speeds to multi-gig "hyper-gig" tiers, up to 5 Gig in limited areas. AT&T prices those faster tiers by address. Its fiber installs often need a technician, and AT&T says they typically take four to six hours.
Check which fiber brand serves your address
In former Quantum Fiber areas, you may see Quantum, AT&T Fiber or both. Enter your ZIP to see current options.
Which one should you pick?
If both brands show up at your address, compare on three points:
- Speed per dollar. If you want a gig, Quantum's $50 offer is hard to beat. If 300 Mbps covers your household, AT&T's $35 entry plan is cheaper.
- Multi-gig needs. AT&T's lineup goes higher where it's built. Most homes don't need more than 1 Gig, though.
- Your phone plan. Both brands now reward AT&T wireless customers. Quantum's $20 a month credit goes on your AT&T wireless bill, so check that your phone plan qualifies.
Since the networks are now under one owner, the fiber itself is comparable. The decision is mostly about the price and the terms in front of you today.
What existing Quantum customers should watch for
- Brand and billing notices. When your market converts, expect emails or letters about a new account, app or payment setup. Read them closely rather than ignoring them.
- Your current price. Ask whether your rate and discounts carry over, and for how long. A switch to a new billing system is a good time to confirm you aren't losing an AutoPay credit.
- Equipment. Ask whether your Wi-Fi gateway will be replaced and whether a technician visit is needed.
- Scams. Ownership changes attract fake "account upgrade" calls. Contact your provider through the number on your bill, not a number from an unexpected text.
Not sure whether to switch or stay put?
We can walk through the plans at your address and what the change to AT&T could mean for your bill.
Frequently asked questions
Does AT&T own Quantum Fiber now?
Yes. AT&T closed its $5.75 billion purchase of Lumen's mass-markets fiber business, which includes Quantum Fiber, on February 2, 2026. Quantum's website now brands the service as Quantum Fiber from AT&T.
Will Quantum Fiber customers be moved to AT&T Fiber?
AT&T has been converting former Lumen fiber customers to the AT&T Fiber brand market by market. Timing varies, so watch for notices from your provider about billing or equipment changes.
Is Quantum Fiber cheaper than AT&T Fiber?
It depends on the speed. AT&T Fiber's entry plan is 300 Mbps for $35 a month in select markets, while Quantum's advertised 1 Gig plan is $50 a month after a new-customer discount and bank AutoPay credit.