Quantum Fiber is an ISP brand under Lumen Technologies that sells gigabit full-fibre broadband (up to 8 Gbps symmetric) and Wi-Fi services directly to residential and small business consumers in select urban markets (Source), (Source).
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About
Quantum Fiber is an ISP brand under Lumen Technologies that sells gigabit full-fibre broadband (up to 8 Gbps symmetric) and Wi-Fi services directly to residential and small business consumers in select urban markets like Denver, Las Vegas, and Minneapolis since its launch in 2020 as the digital-facing arm for Lumen's FTTH rollout, with major milestones including expansion to ~4.16 million fiber-passed homes by end-2024 and a Wi-Fi 7 device rollout in 2023 for enhanced coverage; the brand's Mass Markets operations are being sold to AT&T for $5.75 billion in early 2026 (covering ~95% of subscribers and enablements across 11 states), after which it will no longer exist as an independent Lumen entity but its acquired assets will integrate into AT&T Fiber as of November 2025 (Source), (Source), (Source).
Operator Characteristics
Retail-only ISP?
Yes
Quantum Fiber is retail-only; it exclusively retailed gigabit FTTP services to end-users via automated platforms without owning or operating independent wholesale infrastructure beyond Lumen's shared assets, now transferring to AT&T (Source), (Source).
Business-only ISP?
No
Quantum Fiber is not business-only; it targeted both residential households and small businesses with symmetric fiber plans up to 8 Gbps bundled with Wi-Fi until the 2026 transfer, alongside limited enterprise options via Lumen (Source), (Source).
Quantum Fiber owns Quantum Fiber FTTP, a fiber-to-the-premises network with ~4 million enablements and nearly 1 million subscribers across 11 states like Colorado and Florida for gigabit home/small business internet, set to transfer to AT&T's new NetworkCo subsidiary in early 2026 including associated central office elements but excluding enterprise/wholesale fiber (Source), (Source).
Quantum Fiber sells gigabit full-fibre broadband (up to 8 Gbps symmetric) and Wi-Fi services over its own Quantum Fiber FTTP network (Source), (Source).
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