Chapter 5

Mobile Economics

Spectrum Mobile is the only connectivity line Charter still grows — mobile service revenue rose 22% to $3,762 million in 2025 [1] and 15.1% in the first quarter of 2026, while broadband revenue turned negative [2]. It runs on Verizon's network, carries almost no capital, and management says it is profitable [3]. The filings no longer let anyone check that claim: Charter stopped disclosing mobile's direct cost line after 2022, the last year it showed one — a year in which the product ran a $343 million deficit [4].

The only line still growing

Mobile lines more than tripled in four years, from 3.56 million at the end of 2021 to 11.77 million at the end of 2025, and added another 368,000 in the first quarter of 2026 [5] [6]. It is doing this while consuming almost no capital: mobile capital expenditure was $267 million in 2025, roughly 2% of Charter's $11,659 million total, because as a mobile virtual network operator Charter rents Verizon's radio network rather than building its own [7] [8].

Source: FY2025 Form 10-K, customer statistics and capital-expenditure tables [9] [10].

Source: FY2021–FY2025 Forms 10-K, customer statistics [11] [12].

That growth matters because it is the only thing holding connectivity revenue in positive territory as the broadband engine stalls (The Broadband Base). The question this chapter tests is whether those lines are a profit centre or a retention cost carried in revenue clothing.

The margin the filings used to show

Through 2022, Charter reported Spectrum Mobile as a discrete revenue line and a discrete cost line. On that disclosure, mobile lost money every year at the direct level — before any allocation of overhead, marketing, or the broadband network it rides on:

Source: FY2022 Form 10-K, revenue by product and operating-cost detail [13] [14]. Revenue and cost are the full mobile lines, including equipment.

The deficit was narrowing but persistent: negative $401 million in 2020, negative $311 million in 2021, negative $343 million in 2022 [15]. This is the ordinary economics of a scaling MVNO: acquisition subsidies (free or discounted phones, and Charter's Phone Balance Buyout programme that pays off a switcher's balance at a competitor) and wholesale payments to Verizon ran ahead of a customer base still being built [16]. The reported cost also mixed in equipment sold at or near cost, so the service-only loss was smaller than the headline. But the direction was clear, and it was visible.

What the 2023 reclassification removed

With the 2023 Form 10-K, Charter re-cut both halves of that arithmetic. Mobile service revenue moved into the residential connectivity block; mobile device revenue moved into "Other" revenue alongside processing fees and home shopping [17]. On the cost side, the discrete "Mobile" line disappeared entirely, folded into a new "Other costs of revenue" bucket that also carries franchise fees, produced content, and the Los Angeles Lakers and Dodgers rights [18] [19].

Source: comparison of the FY2022 and FY2023–FY2025 Forms 10-K, revenue-by-product and operating-cost presentations [20] [21].

The reclassification is not itself evidence of anything hidden — Charter reports a single operating segment, and the new taxonomy is defensible. But its effect is that the one product whose standalone profitability an investor most wants to see became the one product it can no longer compute. What replaces the number is management's word. On the fourth-quarter 2025 call, Christopher Winfrey stated it plainly: "Mobile is profitable, it will continue to grow, and improves broadband churn meaningfully" [22].

The economic case behind that claim is real and specific: "Nearly 90% of Spectrum mobile traffic goes over our network already," Winfrey said — Charter's own WiFi and, increasingly, CBRS spectrum — so only a minority of usage incurs a Verizon wholesale charge [23]. Scale spreads the fixed cost of running the MVNO, and offload keeps the variable cost down. Both forces push the same direction the 2020–2022 deficit was already travelling, so a swing to a positive service-level margin by 2025 is entirely plausible. It is simply not disclosed, and the size of the profit — the number that would tell you whether mobile is a rounding error or a genuine second engine — is unknowable from the filings.

Growth sold cheap

What the filings do show is that the growth is volume, not price. Charter's own bridge attributes the 2025 increase in residential mobile service revenue to $714 million from more lines against a $35 million decline from rate [24]. Service revenue per line has held at roughly $30 a month and is edging down, well below the $40–$50 a standalone national carrier collects.

Source: derived from mobile service revenue and average total mobile lines, FY2023–FY2025 Forms 10-K [25] [26].

Low pricing is deliberate. Charter markets mobile as the mechanism that lets a bundled household "save customers over $1,000 in a single year," and in the first quarter of 2026 it launched a $1,000 first-year savings guarantee as the headline of its convergence pitch [27]. The Anytime Upgrade programme lets customers replace devices without the usual wait times or fees, and the Phone Balance Buyout removes the switching cost of a competitor's unpaid device balance [28]. These are the tools of a retention product, priced to keep broadband customers, not of a standalone profit maximiser. That is consistent with the churn benefit management cites and with the low ARPU; it is also consistent with a thin service margin.

The device-financing book underneath

There is a second, quieter dimension to mobile: Charter fronts its customers' phones. Devices are sold on interest-free monthly instalment plans, so Charter recognises the equipment revenue and cost up front but collects the cash over two to three years, carrying the balance as a receivable [29]. Those receivables reached about $2.2 billion of unpaid principal at the end of 2025, funded through a bankruptcy-remote securitisation vehicle — the Equipment Installment Plan Financing Facility — carrying $1.4 billion of debt at a 5.14% rate [30] [31].

Source: FY2025 Form 10-K, Note 10 and equipment-instalment-plan disclosures [32] [33].

This is a modest but real financing operation attached to a connectivity business, and it cuts two ways for cash flow. As the base grew, the mobile-device working-capital swing added about $398 million to 2025 free cash flow — a benefit that fades and can reverse when line growth slows (Cash Conversion). It also means a slice of Charter's balance sheet is now a consumer-device lending book, a category of risk that did not exist five years ago and that the single-segment presentation leaves un-sized beyond the receivable and its allowance.

What the evidence supports

Mobile is asset-light, fast-growing, and the clearest source of the low churn that keeps Charter's broadband base from shrinking faster. Management's assertion that it is now profitable is plausible on the offload-and-scale economics, and the pre-2023 trajectory was already closing the gap. Two facts sit against taking that as settled: the last disclosed direct margin, in 2022, was still negative $343 million, and Charter removed the line that would let an outsider confirm the turn. The revenue is priced as retention — about $30 a line and falling on rate — which fits a product whose job is to defend the broadband relationship more than to earn a standalone return.

The read here is that mobile is best understood as a churn-and-value engine that has probably crossed into positive service margin, not as a proven profit centre of known size. What would change it is disclosure: a segment margin, a return to a discrete mobile cost line, or the wholesale terms of the Verizon MVNO — none of which the current filings provide, and each of which would move the assessment materially in either direction. The pending business MVNO with T-Mobile, launching in 2026, adds a second wholesale relationship whose economics are equally undisclosed [34].