SpaceX Is Buying the Airwaves T-Mobile Just Sold — to Take On T-Mobile

SpaceX agreed on Thursday, October 8, to buy a nationwide block of 800 MHz wireless spectrum from investment firm Grain Management. It's the low-band coverage layer it needs to turn Starlink Mobile into a real US carrier. The twist: Grain bought those exact airwaves from T-Mobile, in a deal that only closed in August. Neither company disclosed a price, but the Wall Street Journal reported SpaceX will pay $8 billion in cash. That's well above the $2.9 billion in cash (plus some 600 MHz licenses) that T-Mobile got for the same spectrum. Wall Street did the math overnight. By Friday's premarket, AT&T was down 6.6%, Verizon 7.23% and T-Mobile 6.79%.

The Deal: 14 MHz That Goes Through Walls

SpaceX describes the asset as a "license portfolio of up to 14 megahertz of paired spectrum in the 800 MHz band." That isn't a lot of bandwidth. What matters is where it sits. Starlink's direct-to-cell service runs on higher frequencies that struggle indoors. Low-band 800 MHz signals travel farther and get through walls, roofs and foliage. That's the gap every satellite-to-phone service has run into.

SpaceX was blunt about why it wants the spectrum. The company said it "addresses one of the key remaining technical gaps that will pave the way for Starlink Mobile to become a major mobile carrier in the US." Elon Musk called it a "very big deal" on X. SpaceX also pointed out that most existing phones already support the 800 MHz band, so customers might not need new hardware. Forbes noted that recent iPhones support the band too, though it's not yet clear they'll work with Starlink Mobile.

The deal is subject to FCC approval. In the same announcement, SpaceX said the FCC had approved its plan for 15,000 Starlink Mobile "Gen2" satellites, which it claims will offer more than 100 times the bandwidth of the current generation. Those satellites will use the 2 GHz spectrum SpaceX bought from EchoStar in a $17 billion cash-and-stock deal announced in September 2025.

From T-Mobile's Balance Sheet to Its Biggest Threat

The spectrum has had quite a year. T-Mobile had been trying to offload its 800 MHz holdings for years, ever since the Sprint merger. It agreed to sell them to Grain in 2025 for $2.9 billion in cash plus all of Grain's 600 MHz licenses. The FCC approved that sale on July 1, 2026, and T-Mobile announced it was complete on August 11. Grain marketed the band for utility networks, enterprise communications and "next-generation direct-to-device satellite services." That last use case turned out to be the one that paid. Two months later, the airwaves are headed to the company that wants T-Mobile's customers.

The timing makes it sharper. Just last week, T-Mobile, AT&T and Verizon formed a joint venture to expand coverage in underserved areas through satellite and direct-to-device services. Starlink was notably left out. T-Mobile has also dropped mentions of Starlink from its own T-Satellite promotions. SpaceX now looks set to compete with the carriers rather than supply them.

Why Carrier Stocks Fell So Hard

The size of the drop depends on when you looked. Reuters put Thursday's after-hours declines at 3.6% for AT&T, 3% for Verizon and 2.7% for T-Mobile. By early Friday premarket, Forbes reported AT&T at $23, Verizon at $43 and T-Mobile at $159.70, all down roughly 7%. SpaceX, which fell 4.19% in Thursday's regular session, rose 3.6% to $166.40 in early trading.

Part of the reaction is about scale. SpaceX went public in a record IPO in June and is now valued at over $2 trillion, CNBC reports. Starlink is its only profitable segment so far: it had 12 million subscribers in 205 countries as of June 30, and earned $1.66 billion in second-quarter operating income on $4.29 billion of revenue. Deutsche Bank estimates the subscriber base reached 13.5 million by the end of September, including 4.1 million in the US. SpaceX also rents out data-center capacity to rival AI labs, as we covered in how SpaceX became the AI industry's compute landlord. A company that size, with existing US customers, spending billions on cellular spectrum, is a different kind of threat from a satellite add-on.

The Carriers Say Physics Is on Their Side

Carrier executives have been dismissive. At a Goldman Sachs event, AT&T CEO John Stankey said direct-to-cell satellite is "solving the last 2%," meaning remote users, not the other 98%. Verizon CEO Dan Schulman told investors that physics will keep satellites from competing with terrestrial networks in cities and suburbs.

Independent analysts partly agree. "This adds fuel to the fire in the battle between SpaceX and the mobile operators," TMF Associates' Tim Farrar told CNBC. He also called it "still a very limited amount of spectrum." Reliable indoor coverage in urban areas would need SpaceX to put towers on the ground. CNBC reports that's the plan: the spectrum would let SpaceX combine satellite and ground-based coverage once it builds out a tower network. SpaceX hasn't said when.

What Happens Next

Regulators have the next move. Besides reviewing the Grain sale, the FCC said this week it will vote on auctioning 25 MHz of "prime spectrum" for satellite-to-phone services. On October 29 it votes on seeking comment about opening another 482 MHz for supplemental coverage from space. Both could help SpaceX, and Amazon too.

For the carriers, the risk isn't that Starlink Mobile replaces their networks next year. It's that the company running the largest satellite communications network (more than 11,000 satellites) now holds both the high-band satellite spectrum and the low-band indoor layer. It's also proving it will pay up to get them. Execution is the open question: SpaceX has already had to rebuild its AI arm after losing every xAI co-founder, and building a ground network is a very different job from launching satellites. Still, after Thursday, the "last 2%" argument is harder for the carriers to make.

Sources

• CNBC: SpaceX deal to acquire spectrum license hammers shares of AT&T, Verizon and T-Mobile
• Forbes: AT&T, Verizon and T-Mobile stocks slump as SpaceX announces key 'Starlink Mobile' deal
• Vantage Markets (citing Reuters): US carrier shares fall after 800 MHz news
• Fierce Network: T-Mobile completes sale of 800 MHz spectrum portfolio to Grain Management
• Cleary Gottlieb: T-Mobile completes $2.9 billion sale of 800 MHz spectrum portfolio to Grain Management
• EchoStar: Spectrum sale and commercial agreement with SpaceX