AT&T charges people and businesses a monthly fee to use its wireless network, its fiber internet lines, and its older copper-wire phone service. Wireless is the biggest piece, bringing in 54% of total operating revenues in 2025. Fiber internet is the fastest-growing piece, with AT&T adding 1.1 million new fiber customers during 2025 to reach 10.4 million total. A small but growing wireless business in Mexico rounds out the picture. Most of the money comes in every month, automatically, from customers who signed up for a plan and keep paying. The diagram below traces where that money goes.
How AT&T Makes Money
flowchart TD
A["Fiber & Wireless
Network Infrastructure"] --> B["Mobility Service
70.1B revenue"]
A --> C["Broadband Service
16.0M connections"]
A --> D["Business Wireline
16.0B revenue"]
B --> E["Equipment Sales
24.5B revenue"]
C --> F["Legacy Voice Decline
10.4B revenue"]
B --> G["Operating Cash Flow
40.3B annually"]
C --> G
D --> G
G --> H["Spectrum Acquisition
and Network Expansion"]
H --> A
E --> I["Customer Lock-in
120M mobility subscribers"]
I --> B
F --> J["Copper Decommissioning
Migrate to Fiber"]
J --> C
Five years of financial data tell a story with three distinct threads. Revenue fell sharply from $134.0 billion in 2021 to $120.7 billion in 2022, then flattened for two years, then climbed back to $125.6 billion in 2025. The 2022 drop happened because AT&T separated its DirecTV video business, shrinking reported revenue overnight. Since then, the core connectivity business has been growing slowly but steadily. Gross margins have improved each year from 2021 to 2024, rising from roughly 76% to nearly 82%, before dipping slightly to about 80% in 2025. That means AT&T keeps more of each dollar it earns before paying for running the business.
AT&T Total Revenue (2021 to 2025)
Billions of dollars. The 2022 drop reflects the DirecTV separation, not a collapse in the core business. Revenue has grown each year since.
The cash the business generates tells a steadier story than the revenue line. Operating cash flow was $42.0 billion in 2021, dipped to $38.3 billion in 2023, and climbed back to $40.3 billion in 2025. That is a lot of cash coming in every year. AT&T uses much of it to pay down debt. Net debt, which is total borrowings minus cash on hand, fell from $156.4 billion in 2021 to $117.9 billion in 2025. That is a reduction of $38.5 billion in four years. The company is still carrying a very large debt load, but the direction is clearly downward.
$38.5B
Reduction in net debt from 2021 to 2025, from $156.4B down to $117.9B
Inside the business, two trends pull in opposite directions. Fiber internet and wireless are growing. Business Wireline, the old copper-based phone and data service sold to companies, is shrinking fast. Business Wireline revenue fell from $20.9 billion in 2023 to $17.2 billion in 2025, and the unit swung from an operating profit of $1.3 billion in 2023 to an operating loss of $816 million in 2025. AT&T knows this is happening and is deliberately winding down the copper network, but the decline is happening faster than fiber and wireless can replace it inside that one business unit.
$20.9B
Business Wireline Revenue 2023
$17.2B
Business Wireline Revenue 2025
A $3.7 billion revenue drop in two years, as corporate customers abandon old copper-based voice and data services.
AT&T faces four specific, documented threats. Each one is worth understanding on its own terms.
What are lead-clad cables?
Decades ago, telephone companies buried cables wrapped in lead to protect the wires inside. Lead is a toxic metal. A 2023 Wall Street Journal investigation raised concerns that these old cables, many of which are still in the ground, could be leaching lead into the environment. AT&T has acknowledged the issue and faces potential lawsuits, government investigations, and new regulations as a result.
The lead-cable issue is the most unpredictable risk AT&T faces right now. The company cannot yet know how many lawsuits will be filed, what new regulations might require, or how much cleanup could cost. On top of that, a cybersecurity incident in July 2024 exposed mobile customer call data. AT&T runs infrastructure that governments consider critical, which makes it a high-value target for sophisticated attackers. A serious future breach could disrupt operations and cost the company significantly. Then there is the supply chain. AT&T depends on a small number of suppliers for key network equipment, and some components come from a single source with no easy backup. Chip shortages, tariffs, and geopolitical tension all make this more fragile. Finally, 43% of AT&T's roughly 133,000 employees are represented by unions. Several labor contracts are set to expire in 2026, and renegotiations could raise costs or, in a worst case, lead to work stoppages.
2021
milestone
AT&T exits the TV business
In July 2021, AT&T closed a deal with investment firm TPG to separate its U.S. video operations into a new standalone company called DIRECTV Entertainment Holdings. AT&T then sold its remaining stake in DIRECTV to TPG in July 2025. This exit ended a years-long experiment in media and entertainment and refocused the company entirely on wireless and fiber connectivity. Revenue shrank as a result, but so did complexity.
The refocus back to connectivity raised a new question. AT&T is spending heavily to build out fiber to 32 states and to expand its 5G wireless network to cover more than 322 million people. The company also has a pending deal to acquire fiber assets from Lumen Technologies and spectrum assets from EchoStar. All of this costs money. The bet is that the customers AT&T wins on fiber and 5G will generate enough new recurring revenue to cover the investment cost, replace the dying Business Wireline revenues, and keep the debt paydown on track at the same time.
What does 'converged customer' mean?
AT&T uses this term to describe a customer who buys both wireless service and home fiber internet from AT&T together. The company believes these customers stay longer and spend more than customers who only buy one service. Building a large base of converged customers is central to AT&T's growth plan.
Consumer Wireline is the clearest evidence that the fiber strategy is working so far. Operating income in that unit rose from $651 million in 2023 to $1.547 billion in 2025, a 78% increase in a single year. Broadband revenue grew 8.7% in 2025, driven almost entirely by fiber. The Consumer Wireline operating income margin reached 10.9% in 2025, up from 4.9% in 2023. These are real, documented improvements in a business that was barely profitable two years ago.
$1.547B
Consumer Wireline operating income in 2025, up from $651M in 2023 as fiber customers grow
AT&T's Mexico wireless business quietly turned profitable in 2025, posting $145 million in operating income after losing $141 million in 2023. It is small, about 3% of total segment revenues, but it is no longer a drag.
The Bet
AT&T's fiber and 5G networks attract enough new customers, and keep them long enough, to offset the ongoing collapse of Business Wireline legacy revenues while still generating the cash needed to continue paying down $117.9 billion in net debt. If fiber penetration in new markets stalls, if competitors match AT&T's network quality at lower prices, or if the Business Wireline decline accelerates faster than fiber revenue grows, the math stops working. The entire model assumes that owning the physical network gives AT&T a durable cost and quality advantage that monthly subscribers will keep paying for.
Open question
AT&T has spent years and tens of billions of dollars rebuilding itself around fiber and 5G after a costly detour into television and media. The financial data show real progress: debt falling, fiber customers growing, margins improving in the right places. But Business Wireline is losing money, legacy copper revenues keep shrinking, the lead-cable liability is unquantified, and the company still carries nearly $118 billion in net debt. Can fiber and 5G grow fast enough, and stay profitable enough, to replace what copper is losing before the debt load and legacy liabilities consume the gains?
Compiled · 10-K · FY2025
Regulatory and Litigation
AT&T faces ongoing litigation and government investigations related to lead-clad telecommunications cables following 2023 Wall Street Journal articles raising public health and environmental concerns. The company may face additional lawsuits, government investigations, and new regulations or legislation, which could result in significant financial costs and reputational damage.
Supply Chain and Inflation
AT&T depends on suppliers for critical network equipment and devices, with some provided by single-source suppliers with few alternatives. Recent inflation, semiconductor shortages driven by artificial intelligence spending, tariffs, and geopolitical instability have increased costs and could severely disrupt the company's ability to provide products and services on time.
Cybersecurity
AT&T experienced a cybersecurity incident in July 2024 where mobile customer call data was copied. As a critical infrastructure provider, the company faces heightened risk from state-sponsored and sophisticated attackers, and a major cyberattack could cause equipment failures, customer data breaches, operational disruptions, and significant financial losses.
Network Investment and Technology Deployment
AT&T must spend substantial capital to deploy 5G networks and expand fiber infrastructure to compete, but delays in equipment standards, supplier issues, software problems, and permitting delays could prevent timely deployment. If the company cannot acquire needed spectrum or if customers reject its 5G and fiber offerings, its ability to attract customers and maintain profit margins could be seriously harmed.
Labor Costs
Approximately 43 percent of AT&T's workforce is represented by unions including the Communications Workers of America and International Brotherhood of Electrical Workers. Contract renegotiations could result in higher labor costs or work stoppages that disrupt business operations.
10-K Item 1A · Risk Factors
