Of all the technical barriers between satellite internet and an ordinary phone call, one has mattered most: buildings. Signals from orbit struggle to reach devices indoors. That is why SpaceX’s purchase of nationwide low-band spectrum — up to 14 megahertz of paired airwaves in the 800 MHz band — is being treated as the missing piece for its Starlink Mobile service.
Low-band frequencies travel far and pass through walls far better than the higher bands satellites typically use, and they are supported by most mobile devices already in people’s pockets. SpaceX says that, with Federal Communications Commission approval, it will pair its satellite-to-cell constellation with an advanced terrestrial network, so a phone can move between orbit and ground towers without the user noticing. The company describes the spectrum as addressing one of the key remaining technical gaps on the way to becoming a major U.S. mobile carrier.
The regulatory runway is clearing. Federal regulators recently authorized SpaceX to deploy 15,000 direct-to-phone satellites, and the FCC is set to vote October 29 on proposals to auction additional spectrum for direct-to-device services and to modernize the rules for supplemental coverage from space.
Challenges remain formidable. Fourteen megahertz is a thin slice compared with the holdings of incumbent carriers, and reliable urban coverage will require thousands of ground sites. Starlink Mobile is targeting a 2027 launch. The technology question is no longer whether satellite phone service works — it is whether it can work indoors, at scale, at a price people will pay.
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