SpaceX’s route into US mobile began as a partner-first proposition: Starlink would extend carrier networks into places where towers did not reach. Its current US partner is T-Mobile, which leased Starlink 10 MHz of mid-band spectrum for satellite-to-phone service.¹

That arrangement is now being overtaken by a more ambitious plan. SpaceX has agreed to buy up to 14 MHz of paired 800 MHz spectrum from Grain Management—licenses that originated with T-Mobile after its Sprint acquisition. The spectrum covers virtually the entire US population, though the amount available varies by county.¹

The company says the purchase closes a crucial technical gap. Low-band 800 MHz spectrum travels farther and penetrates buildings better than higher-frequency signals, allowing a terrestrial layer to work alongside Starlink’s satellites. “With this new low-band spectrum and our Gen2 constellation, Starlink Mobile can now become the first network operator to deploy both satellite and terrestrial spectrum,” SpaceX said.²

The timing sharpens the competitive threat. The FCC has approved 15,000 next-generation direct-to-device satellites, which SpaceX says will offer more than 100 times the bandwidth of its current generation. Musk also affirmed a claim that phones arriving in 2027 and 2028 will carry chipsets able to handle Starlink Mobile’s higher-throughput spectrum natively.Elon Musk (elonmusk)³

SpaceX’s vision is no longer merely a backup signal for carrier dead spots. It has told regulators its network would use radios and sectorized antennas on towers, rooftops and other structures, backed by satellites, to offer broadband service indoors and out.¹ Shares in AT&T, T-Mobile, Verizon and AST SpaceMobile fell after the deal emerged.¹

The push has critics. The Rural Wireless Association opposed SpaceX’s earlier EchoStar spectrum purchase, arguing that such transactions deepen a “troubling pattern of spectrum aggregation” at the expense of rural providers.¹ The three largest US carriers, meanwhile, have formed a satellite-focused joint venture to pool spectrum for dead-zone coverage—an answer to the competitor growing inside their own ecosystem.¹