T vs TMUS: How AT&T and T-Mobile US Compare (2026)
Last updated August 2026
Short answer
T and TMUS are similarly sized, but T trades noticeably cheaper on forward earnings (9.07x vs 11.96x): the market is paying up for TMUS's profile and pricing T more conservatively, or for faster growth. Which you prefer comes down to the drivers you believe, and whether adding either over-concentrates what you already own.
T vs TMUS: the tie-breaker metrics
Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.
| Metric | T | TMUS | What it tells you |
|---|---|---|---|
| Market cap | $159.32B | $185.26B | Size. The larger name is the incumbent; the smaller has more room to grow and more to prove. |
| Forward P/E | 9.07 | 11.96 | Valuation on next year's expected earnings, the same yardstick for both. Lower is cheaper for that growth; higher means the market is paying up. |
| Trailing P/E | 7.67 | 18.05 | Valuation on the last 12 months. A big drop from trailing to forward means the market expects earnings to jump, so more growth is already in the price. |
| Beta | 0.42 | 0.32 | Volatility vs the market. Above 1 swings harder than the index; below 1 is steadier. Higher beta means bigger drawdowns to hold through. |
| Price vs 52-week range | 34% of range | 7% of range | Where today's price sits between the 52-week low and high. Near the high is momentum with less margin of safety; near the low is out of favor or a discount, depending on why. |
| Price / book | 1.45 | 3.36 | How much you pay over book value. Very high can signal an asset-light, high-return business or a rich price. |
Reading it: T is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.
Before you buy: how T and TMUS affect your concentration
The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. T and TMUS share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.
This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined T and TMUS exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.
What does AT&T (T) do?
AT&T Inc. is a US telecommunications giant whose core business is wireless connectivity through its Mobility unit, which serves tens of millions of postpaid phone customers, alongside a growing consumer wireline business centered on fiber and fixed-wireless home internet. It also runs a business wireline and connectivity segment serving enterprises. After a costly detour into media (the WarnerMedia acquisition and later spinoff) and pay-TV, AT&T has deliberately simplified back into a pure connectivity company, selling its remaining DirecTV stake to TPG and reinvesting in network infrastructure. Its revenue comes mainly from recurring monthly service plans, which makes results relatively steady but slow-growing.
What does T-Mobile US (TMUS) do?
T-Mobile US, Inc. is one of the three national wireless carriers in the United States, alongside Verizon and AT&T. Built into a scale player by its 2020 merger with Sprint, T-Mobile has leaned on a large mid-band 5G spectrum position and its Un-carrier marketing to become the fastest-growing of the big three, consistently leading the industry in postpaid phone and account net additions. The heart of the business is postpaid wireless service revenue, a high-margin, recurring stream that has been growing at a double-digit pace, supported by rising subscriber counts and average revenue per user.
T vs TMUS: how do they differ?
Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.
- T drivers: Fiber and fixed-wireless expansion; Steady wireless service revenue.
- TMUS drivers: Postpaid wireless subscriber leadership; 5G home broadband and fiber expansion.
Which fits which kind of investor
A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: The largest risk is debt: AT&T carries well over $130 billion in total debt, so higher-for-longer interest rates raise refinancing costs and limit flexibility. For TMUS, the main risk is intense, three-way competition: Verizon and AT&T are large, well-funded rivals, and aggressive promotions or price cuts across the industry can pressure subscriber growth and margins.
T or TMUS: which should you pick?
T vs TMUS: the full fundamentals
T. These figures are approximate and tied to the asOf date; verify live numbers before acting. AT&T is valued like a mature, income-oriented telecom, so the dividend yield, free cash flow, and debt trajectory matter more than headline growth. A low multiple can reflect slow growth and heavy leverage rather than a bargain, so weigh the yield against the balance sheet.
TMUS. These figures are approximate and tied to the asOf date; verify live numbers before acting. T-Mobile trades at a premium to typical telecom peers because it has been the growth leader, so its valuation depends on continued subscriber and cash-flow momentum rather than pure yield. Guidance points to further EBITDA and free-cash-flow growth, but competitive intensity, capital spending, and integration of recent deals could change the trajectory, so confirm current results and guidance before acting.
Headline figures (approximate, Jul 2026): T shows revenue trend Low-single-digit growth; Q1 2026 revenue ~$31.5 billion, up ~2.9% year over year, led by wireless and fiber, profitability Adjusted EPS rose ~12% in Q1 2026; full-year adjusted EPS guided to roughly $2.25 to $2.35; adjusted EBITDA growth ~3 to 4%, balance sheet / leverage High debt, well over $130 billion total; net debt-to-EBITDA targeted toward ~3x by end of 2026, valuation Trades at a modest earnings multiple typical of mature telecoms; market cap roughly $145 billion to $150 billion in mid-2026; TMUS shows revenue (ttm) Large and growing; Q1 2026 total revenue was ~$23 billion, with postpaid service revenue up roughly 15% year over year, profitability Solidly profitable with strong margins; 2026 EBITDA guided to roughly $37 billion or more, growth profile Industry-leading postpaid and broadband net additions; growth leader among the three national US carriers, valuation multiple Trades at a premium to slower-growing telecom peers, reflecting its faster subscriber and cash-flow growth.
The bottom line: T vs TMUS
T and TMUS are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined T and TMUS exposure against your real portfolio. It is not an investment adviser.
Wondering how T or TMUS fits the portfolio you already own? Walnut is an AI investing app that connects your brokerage read-only and answers questions like that about your actual holdings: overlap, concentration, and how each position tracks the S&P 500. Compare the best AI portfolio analyzers or see the best AI investing apps in 2026.
Investing in AT&T with AI
Connect the broker you already use and ask Walnut's AI how T fits what you actually hold: whether you own it already through a fund, what it would do to your concentration, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.
FAQ
What is the difference between T and TMUS?
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AT&T Inc. T-Mobile US, Inc. They show up together because they share investment themes, but they are different businesses, so the better fit depends on which thesis you are expressing.
Is T or TMUS the better stock?
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Neither is universally better; they suit different views and risk levels. Walnut is informational, not investment advice. Compare what each does, the tie-breaker metrics above, and the risks, then decide which fits your thesis and what you already own.
Which is cheaper, T or TMUS?
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On forward P/E (as of August 2026), T trades at 9.07x and TMUS at 11.96x, so T is the cheaper of the two on next year's expected earnings. A lower multiple is not automatically the better buy: a richer valuation can be justified by faster growth, and a lower one can reflect real risk. Weigh the multiple against how fast each business is compounding.
Should you own both T and TMUS?
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Because they share themes, owning both concentrates you in that theme. That can be intentional (a focused bet) or accidental (less diversification than it looks). Walnut can show your combined exposure across both, and whether adding either over-concentrates you, before you buy.
What are the risks of T vs TMUS?
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T: The largest risk is debt: AT&T carries well over $130 billion in total debt, so higher-for-longer interest rates raise refinancing costs and limit flexibility. Competition is fierce, with Verizon and T-Mobile fighting for the same wireless subscribers, plus cable companies (Comcast, Charter) offering wireless through their own networks, which pressures pricing and can force costly promotions. The dividend has been flat since a 47% cut in 2022, and some analysts question whether growth can fund both aggressive fiber capital spending and rising payouts. Fiber buildout is capital-intensive and takes years to earn returns. Wireless is a mature, saturated market, so top-line growth is structurally slow, and any subscriber losses or price wars would hit results quickly. TMUS: The main risk is intense, three-way competition: Verizon and AT&T are large, well-funded rivals, and aggressive promotions or price cuts across the industry can pressure subscriber growth and margins. Cable companies (Charter, Comcast) selling wireless through their own agreements and fixed-wireless and fiber competition add further pressure on both wireless and broadband. Telecom is capital-intensive: maintaining and upgrading a national 5G network, plus building fiber, requires heavy ongoing spending and can strain free cash flow if competition forces faster investment. Recent deals (Metronet, UScellular) bring integration and execution risk, and moving into fiber is capital-heavy and lower-margin than wireless. T-Mobile also carries substantial debt from past acquisitions, so higher interest rates raise financing costs. Finally, its dividend yield is modest relative to Verizon and AT&T, so income-focused investors may find it less attractive, and any stumble in subscriber momentum could weigh on a stock priced for continued growth.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell T or TMUS; figures are approximate and dated (as of August 2026). Verify current data before investing.