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). CenturyLink launched gigabit fiber service in 2014 (Source).
Quantum Fiber builds and operates its own FTTP network infrastructure for gigabit broadband services (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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