Market take: SpaceX $SPCX entering mobile service? That’s the naive read. What they’re actually building is an ecosystem — and this is just the opening move. Last week SpaceX agreed to buy up to 14 megahertz of nationwide 800 MHz low-band spectrum from Grain Management for roughly $8 billion. Musk called it “the last critical piece of the spectrum puzzle needed for SpaceX to provide complete phone coverage in America.” That deal stacks on top of the $17 billion EchoStar acquisition — 65 megahertz of mid-band — which the FCC approved back in May. Together, SpaceX now holds exclusive-use nationwide spectrum that lets Starlink Mobile bypass cell towers entirely, and the Big Three felt it: AT&T, Verizon, and T-Mobile all dropped five to ten percent in extended trading. But the spectrum is only the ground layer. The FCC has also cleared SpaceX to launch 15,000 satellites for Starlink Mobile Gen 2, with next-gen satellites starting to fly in 2027 and service targeted for the end of that year. And on September 28, Starship reached orbit for the first time, deploying 26 V3 satellites — each delivering about 1 terabit per second of downlink, roughly ten times a V2. A fully loaded Starship can carry up to 60 V3s, about twenty times the capacity of a Falcon 9 launch. Without Starship, none of this scales. Then there’s the endgame: Starmind, SpaceX’s orbital AI data center constellation — up to one million satellites between 500 and 2,000 kilometers, filed with the FCC in January. The first AI1 satellites, powered by Nvidia chips, are targeted for the fourth quarter of 2027, with significant scale in 2028. SpaceX has already signed deals with Anthropic and Google to rent out orbital compute. Musk’s math: 100 gigawatts of orbital compute per year takes on the order of 10,000 Starship launches, and the long-term ambition reaches a terawatt. And the broadband layer is already in motion too. In July, SpaceX quietly filed for a 100,000-satellite Gen3 constellation at roughly 323 to 477 kilometers — individual satellites weighing up to 2,500 kilograms, with solar arrays spanning 300 to 400 square meters once deployed. That’s a separate proposal from Starmind, but it shows the same pattern: SpaceX files for numbers that sound absurd, then negotiates down from there. Here’s the part most people miss: if you want AI agents available to every human on Earth, it’s impossible without space. Terrestrial data centers are already straining power grids, and solar on the ground is intermittent — you need batteries, land, and infrastructure that doesn’t scale to a terawatt. In orbit, sunlight is nearly constant, especially in sun-synchronous orbits, and there’s no atmosphere to filter it. Infinite energy from the sun is the only way to make universal AI access physically possible. SpaceX isn’t building a phone company. It’s building the infrastructure layer for AI itself — ground network to reach people, orbit to compute, and Starship to connect the two.