MAJORHOLDERS.COM RESEARCH
CABLE & TELECOM · JULY 2026
Industry Research · Broadband Competition · Companion to "Starlink's Capacity Curve"

Comcast's Counterattack: Cable-Powered Wireless vs. the FWA Threat

Fixed wireless access poached millions of cable broadband customers by selling spare 5G capacity as home internet. Comcast's response inverts the play: sell mobile service carried mostly on the cable network it already owns — because ~90% of "mobile" data is consumed at or near a building cable already serves.

~90%
Xfinity Mobile traffic offloaded to Comcast WiFi
435K
Record wireless line adds, Q1 2026
$922M
Cable CBRS spectrum investment (Comcast + Charter)
−65K
Q1 2026 broadband loss — smallest in two years

1. The threat: FWA turned spare tower capacity into a cable-killer

Fixed wireless access (FWA) is home internet delivered over a 5G network: a receiver in the home connects to T-Mobile's or Verizon's towers instead of a wire. Priced at roughly $40–60/month with no installation or contract, it monetizes capacity the carriers built for phones — near-zero marginal cost, aimed straight at cable's price-sensitive base.

The damage is visible in the subscriber ledger. Charter and Comcast peaked in 2023 at 32.3M and 30.6M broadband subscribers respectively and have each shed over a million since, while the Big 3 carriers grew FWA past 20 million subscribers with spectrum capacity for up to 32 million. The chart below shows the transfer.

The share transfer: Big-3 FWA subscribers vs. combined Comcast + Charter broadband (millions)
0 20M 40M 60M 202120222023 20242025Q1'26 peak ~62.9M ~59.6M 20M+ ~1M
Comcast + Charter broadband subs (approx.) T-Mobile + Verizon + AT&T FWA subs (approx.)
Approximate end-of-period figures compiled from company reports and analyst coverage. Cable combined peaked in 2023; FWA net adds are expected to slow in 2026 as spectrum headroom fills.
Why FWA has a ceiling: it runs on leftover tower capacity. Once a cell fills, carriers stop selling FWA there and protect mobile users. New Street Research puts total Big-3 FWA headroom at ~32M subscribers — meaning much of the runway is already consumed — and all three carriers are pivoting to fiber acquisitions (Frontier, Lumen, T-Mobile's fiber JVs) for the durable asset. The FWA product plateaus; the competitive pressure it introduced is permanent.

2. The counter: a three-layer wireless network built on the cable plant

Comcast's CEO said in May 2026 that wireless — not cable TV or internet — is now the company's top priority. The strategy exploits a physical fact: people spend most of their day at home or at work, inside or near buildings Comcast's network already passes. So instead of building a national cellular network, Comcast carries "mobile" traffic on wireline infrastructure wherever the customer is stationary, and rents a carrier's network only for the sliver of true mobility.

Where an Xfinity Mobile gigabyte actually travels
LAYER 3 · Verizon MVNO (rented) True mobility — highways, travel, out-of-footprint. Per-GB wholesale cost paid to a competitor. ~10% LAYER 2 · Own 5G small cells — CBRS 3.5 GHz (owned, growing) Radios on the cable plant in dense, high-traffic zones. Licenses cover ~80% of homes passed. Squeezes Layer-3 costs. <5%→ LAYER 1 · WiFi offload — nation's largest WiFi network (owned) Millions of hotspots + customer gateways. Carries the bulk of traffic at near-zero marginal cost. ~90% CABLE PLANT — DOCSIS / FIBER BACKHAUL (the asset FWA can't replicate) Locally scalable capacity · already passes the places people actually use data
Traffic shares are approximate. Comcast reports ~90% of Xfinity Mobile traffic rides its WiFi network; CBRS is deployed "selectively" in high-ROI markets (Philadelphia is the lead market, at the FCC's 40 MHz per-entity cap), with the Verizon MVNO covering the remainder.

The economics of each layer

WiFi (Layer 1) is why the model is profitable: Xfinity Mobile turned profitable on a standalone basis in 2021 and has stayed there, because the dominant share of traffic rides infrastructure Comcast already paid for. CBRS (Layer 2) is the cost-reduction lever: Comcast and Charter have invested $922 million in spectrum with Nokia and Samsung vendor commitments across 23 markets in deployment or targeted. Charter has quantified the prize — offloading 30% of traffic to owned infrastructure translates to roughly $530 million in annual wholesale savings. The two operators' arrangements even allow cross-footprint routing, so a Charter customer's traffic in Comcast territory can ride Comcast's CBRS radios and vice versa. The MVNO (Layer 3) shrinks as Layers 1–2 grow, but never disappears: Comcast explicitly has no plans to build a full national wireless network, and even sold its 600 MHz coverage spectrum to T-Mobile after concluding CBRS + WiFi could carry the load in its footprint.

3. Is it working? The Q1 2026 scoreboard

MetricResultRead-through
Wireless line net adds, Q1 2026+435,000 (record)Free-line-with-broadband bundle is landing
Prior record (Q3 2025)+414,000Momentum is sequential, not one-off
Broadband net adds, Q1 2026−65,000Smallest loss since Q1 2024; −117K improvement YoY
Video net adds, Q1 2026−322,000Legacy decline continues; wireless must offset it
Xfinity Mobile traffic on own WiFi~90%Wholesale exposure to Verizon is contained
Broadband pricing5-year price guaranteesTrades ARPU for churn reduction; margin rebuilt via mobile

The pattern is convergence defense: the same churn-reduction logic AT&T reports on the fiber side, where bundled fiber-plus-wireless customers are stickier and more valuable — AT&T's organic convergence rate reached 45% of home internet customers. Comcast is running the mirror image: broadband as the anchor, mobile as the retention wrapper, with simplified pricing absorbing the ARPU hit while mobile bundling rebuilds margin.

4. Assessment: what the strategy can and cannot do

Structural strengths

  • Inverts the FWA play. Carriers sell spare wireless capacity as home internet; Comcast sells spare wireline capacity as mobile. Each side attacks with its zero-marginal-cost asset.
  • Usage geography favors cable. Most data is consumed where people are stationary — precisely where the cable plant is. ~90% offload is the proof.
  • Capital-light and already profitable since 2021, with CBRS adding a path to ~$530M-class wholesale savings at scale.
  • Churn math. Bundled customers defect less; Q1 2026 shows broadband losses narrowing as mobile attach rises.

Structural limits

  • Permanent dependency for true mobility. Highways, travel and out-of-footprint coverage ride Verizon's network — a competitor sets the wholesale terms.
  • CBRS execution history is mixed. As recently as early 2025, independent analysis found little at-scale cable CBRS deployment; the ramp is real but young, and 3.5 GHz faces attenuation limits in dense zones.
  • It defends margin, not share. Wireless slows the bleed; it does not restore broadband growth against fiber overbuild and, next, Starlink's V3 capacity wave in exurban markets.
  • Scale answer may still be M&A — analysts continue to flag a Comcast–Charter combination as the endgame response to permanent competition.
Bottom line: Comcast cannot out-wireless the carriers and doesn't need to. It needs mobile to be good enough and cheap enough that a broadband household sees no reason to leave for a T-Mobile bundle. Because ~90% of usage happens where cable already is, the economics of cable-powered wireless genuinely favor Comcast inside its own footprint — a defensive moat built from an offensive product. The 2026 evidence reads as stabilization, not decline; the open question is whether stabilization holds once Starlink's capacity curve (see companion report) opens a national value tier in 2027–2029.

5. Sources

  1. Light Reading, "Wireless now Comcast's top priority, CEO says" (May 2026) — WiFi offload ~90%, CBRS market posture
  2. Cord Cutters News, "Comcast CEO Says Its Main Priority Is No Longer Cable TV or Internet Service" (May 2026) — Q1 2026 video/broadband losses
  3. Light Reading, "How Charter and Comcast build their way out of Verizon dependency" (Feb 2026) — $922M spectrum, 23 markets, 30% offload / ~$530M savings, cross-footprint routing, Philadelphia 40 MHz
  4. Comcast corporate, "Comcast's Evolving Wireless Strategy" and "Comcast in Wireless — Building a Strategy for Sustained Growth" — CBRS + 600 MHz strategy, ~80% homes-passed coverage, profitability since 2021, 600 MHz sale to T-Mobile
  5. FactSet Insight, "U.S. Wireless Operators Increase Focus on Fiber" (July 2026) — cable subscriber peaks and Q1 2026 losses, pricing strategy
  6. Fierce Network, "The Big 3 now have room for 32 million FWA customers" (Dec 2025) — New Street Research FWA capacity estimate
  7. The Motley Fool, "Where Are Comcast and Charter's Internet Customers Going?" (May 2026) — FWA subscriber transfer
  8. Mobilewalla, "What Broadband Switching Data Reveals About Market Competition" (June 2026) — switching rates, Comcast Q1 wireless adds
  9. TelecomLead, "Xfinity Mobile and Spectrum Mobile Outpace Industry Speeds with Wi-Fi-Driven Gains" (Apr 2026) — CBRS physical constraints
  10. Light Reading, "A hunt for cable's CBRS deployments turns up... not much" (Feb 2025) — deployment-pace caveat
  11. Company earnings releases and calls: Comcast, Charter, AT&T, Verizon, T-Mobile (Q1 2026)
Disclosures. Figures compiled from public company disclosures, earnings coverage and third-party analyst reports as of July 2026; chart values marked approximate are majorholders.com estimates where companies do not disclose exact counts (e.g., T-Mobile's Q1 2026 FWA base). This report is for informational purposes only and is not investment advice, an offer, or a solicitation. Companion report: "Starlink's Capacity Curve: From Rural Niche to Broadband Contender" (majorholders.com, July 2026).