Both are 100% fiber. Both have symmetric speeds and no data caps. So what's the difference? AT&T wins on 28-state availability, wireless bundling, and the AT&T Guarantee. Quantum Fiber wins on 8 GIG max speed and Price for Life. See the full breakdown.
Both are 100% fiber-optic — so the differences come down to speed, availability, bundling, and price guarantees. Here's every spec that matters, side by side.
| Feature | AT&T FiberFiber-optic | Quantum FiberFiber-optic |
|---|---|---|
| Technology | 100% fiber-optic | 100% fiber-optic |
| Max download speed | 5,000 Mbps (5 GIG) | 8,000 Mbps (8 GIG) |
| Max upload speed | 5,000 Mbps (symmetric) | 8,000 Mbps (symmetric) |
| Data cap | None — unlimited data | None — unlimited data |
| Starting price | $35/mo (300 Mbps) | $30/mo (300 Mbps) |
| 1 GIG price | $50/mo | $50/mo |
| Top-tier price | $95/mo (5 GIG) | $150/mo (8 GIG) |
| Contract | No annual contract | No annual contract |
| Price guarantee | AT&T Guarantee — price locked | Price for Life guarantee |
| Availability | 28 states, 25M+ locations | Fewer states & metro areas |
| Wireless bundling | Bundle with AT&T Wireless | No mobile network |
| TV bundling | DIRECTV available | No TV service |
When both providers offer fiber, the deciding factors are availability, bundling, and ecosystem. Here's where AT&T Fiber has the edge over Quantum Fiber.
AT&T Fiber is available across 28 states and passes 25+ million locations — a much larger footprint than Quantum Fiber. The odds of AT&T Fiber being at your address are significantly higher, especially outside Quantum's core metro markets.
AT&T is one of the largest wireless carriers in the country. Bundle AT&T Fiber with AT&T Wireless and save on both — one bill, one provider, real discounts. Quantum Fiber has no mobile network, so there's no equivalent bundle.
AT&T's price-lock guarantee means your internet rate stays put — no surprise hikes, no promo-rate traps. Combined with no annual contract, you get predictable pricing and the freedom to leave anytime. Peace of mind built in.
AT&T Fiber pairs with DIRECTV for a complete home entertainment package — fiber internet plus live TV, sports, and streaming. Quantum Fiber offers no TV service of its own, so you'd need a separate provider for television.
AT&T's 5 GIG plan is $95/mo — a strong price for 5,000 Mbps symmetric. Quantum's 8 GIG plan costs $150/mo, which is 58% more for 60% more speed. For most users, AT&T's 5 GIG delivers better value per dollar.
AT&T Fiber + AT&T Wireless + DIRECTV = one account, one app, one bill. Quantum Fiber can only provide internet. If you want simplicity and a single relationship for all your connectivity, AT&T is the obvious choice.
Quantum Fiber is a strong fiber competitor. Here's where it genuinely outperforms AT&T — and why it might be the right choice depending on your priorities.
Quantum Fiber's top plan reaches 8,000 Mbps — 60% faster than AT&T's 5 GIG maximum. For power users, content creators, and households with extreme bandwidth needs, Quantum's 8 GIG tier offers the highest consumer fiber speed available.
Quantum Fiber's Price for Life guarantee means your monthly rate won't change for as long as you keep your plan — no expiration, no fine print. It's one of the strongest price-lock promises in the industry and a genuine advantage for long-term cost certainty.
Quantum Fiber's 300 Mbps plan starts at $30/mo — $5 less than AT&T Fiber's $35/mo entry tier. If you're on a tight budget and only need basic fiber speeds, Quantum's floor is slightly lower (though both are excellent value for fiber).
Bottom line: Quantum Fiber is an excellent fiber provider — if it's available at your address and you don't need wireless or TV bundling. AT&T Fiber wins on availability, ecosystem, and overall value.
See exactly what you pay at each speed tier. Both offer fiber pricing with no data caps and no contracts. AT&T's advantage is bundling; Quantum's is Price for Life.
All plans: no data cap, no annual contract, symmetric speeds. AT&T Guarantee locks your price. Bundle with AT&T Wireless for additional savings. Prices with AutoPay & paperless billing.
All plans: no data cap, no annual contract, symmetric speeds. Price for Life guarantee on select plans — your rate won't change as long as you keep service. No wireless or TV bundle available. Prices with AutoPay & paperless billing.
At 1 GIG, both providers are tied at $50/mo. AT&T's 5 GIG at $95/mo is a better value than Quantum's 8 GIG at $150/mo for most households — and AT&T lets you bundle wireless.
Both AT&T Fiber and Quantum Fiber deliver true fiber-optic performance: symmetric speeds, no data caps, and no annual contracts. Quantum Fiber has the edge on raw top speed (8 GIG) and its Price for Life guarantee. But AT&T Fiber wins on 28-state availability, wireless and DIRECTV bundling, the AT&T Guarantee, and better value at the 5 GIG tier. For most households — especially those who want internet, mobile, and TV from one provider — AT&T Fiber is the smarter choice.
Quantum Fiber offers higher top speeds — up to 8 GIG (8,000 Mbps) in select areas, compared to AT&T Fiber's 5 GIG (5,000 Mbps) maximum. Both offer symmetric upload and download speeds. For most households, 5 GIG is more than enough bandwidth, but if you need the absolute fastest connection available and Quantum Fiber is at your address, its 8 GIG tier has the edge.
AT&T Fiber has significantly wider availability, serving customers across 28 states and passing 25+ million locations. Quantum Fiber (operated by Lumen/CenturyLink) is available in fewer states and metro areas. If AT&T Fiber is at your address, it's generally the more convenient choice. Check availability to see which providers serve your location.
The AT&T Guarantee is AT&T's commitment that your price won't change — no hidden rate hikes on your internet plan. It provides price stability and peace of mind for the life of your service. Quantum Fiber offers a similar 'Price for Life' guarantee on select plans, so both providers offer price-lock promises, though terms and conditions may vary.
AT&T Fiber offers seamless bundling with AT&T Wireless — you can combine fiber internet with AT&T mobile plans and save on both. AT&T also offers DIRECTV bundles. Quantum Fiber does not have a comparable wireless ecosystem, as Lumen does not operate a major mobile network. If you want one provider for internet and mobile, AT&T is the clear choice.
No. Both AT&T Fiber and Quantum Fiber offer unlimited data with no data caps on their fiber internet plans. This is a major advantage of fiber over cable providers like Xfinity, which enforces a 1.2 TB monthly data cap. With either AT&T Fiber or Quantum Fiber, you can stream, game, and download without worrying about overage fees.
Pricing is competitive at similar tiers. AT&T Fiber starts at $35/mo for 300 Mbps and offers 1 GIG for $50/mo. Quantum Fiber starts at $30/mo for 300 Mbps and also offers 1 GIG for $50/mo. AT&T's advantage is bundling — combining AT&T Fiber with AT&T Wireless can lower your total monthly cost. Quantum Fiber's Price for Life guarantee means your rate won't increase, which can save money over time.
No. Both AT&T Fiber and Quantum Fiber offer month-to-month plans with no annual contract and no early termination fees. This is a shared advantage of fiber providers over many cable companies. You can cancel or change plans at any time without penalty.
One quick check tells you if AT&T Fiber is available where you live. If it is, you could switch today — no contract, no data cap, symmetric speeds up to 5 GIG, and the AT&T Guarantee.