AST SpaceMobile

AST SpaceMobile is attempting something categorically different from every other operator in this directory. It is not building a satellite network that connects to a dish. It is building a cellular tower in space — one that talks directly to an ordinary, unmodified smartphone, with no special hardware, no app and no change in behaviour by the person holding it.

If it works at scale, the addressable market is not the roughly 400 million households without broadband. It is every mobile phone on Earth, and the dead zones in the coverage map of every mobile operator on Earth. That is the bull case, and it is why a pre-revenue company has commanded a multi-billion-dollar valuation.

The Physics Problem

A phone is a terrible satellite terminal. It has a tiny antenna, almost no transmit power, and it is usually in a pocket. Closing a link between that and a spacecraft several hundred kilometres up is genuinely hard, and the way you solve it is by making the satellite enormous — a vast phased array that can hear a very weak signal and concentrate a strong one back down.

This is why AST’s satellites are unlike anything else in LEO. BlueWalker 3, the 2022 test article, unfolded an array of roughly 693 square feet — briefly one of the brightest objects in the night sky, and the source of a still-unresolved fight with the astronomy community. The operational BlueBird Block 2 satellites are larger still, in the region of 2,400 square feet.

Large arrays are heavy, hard to fold, hard to launch and hard to deploy reliably. Every engineering risk this company carries flows from that single unavoidable requirement.

What Has Actually Been Demonstrated

• September 2022 — BlueWalker 3 launched; array successfully unfolded.
• April 2023 — the first two-way voice call from an unmodified smartphone via a satellite. A genuine technical first.
• 2023 — 4G and then 5G data sessions to standard handsets, with download speeds demonstrated in the tens of Mbps.
• September 2024 — the first five commercial BlueBird Block 1 satellites launched.

The credit due here should not be understated: AST proved the core technical claim that most of the industry assumed was implausible. The question was never whether it could be done once. It is whether it can be done continuously, at scale, profitably — and that requires a great many more satellites.

Business Model

AST does not sell to consumers and does not intend to. It sells coverage, wholesale, to mobile network operators, who resell it to their own subscribers as an extension of their existing service — typically revenue-shared.

This is a shrewd model. The MNO already owns the customer, the billing relationship and — critically — the spectrum. AST operates in the partner’s licensed terrestrial spectrum from orbit, which sidesteps the need to acquire global satellite spectrum of its own and turns a potential adversary into a distribution channel.

Agreements and understandings span AT&T, Verizon, Vodafone, Rakuten, Bell Canada and dozens of other operators, which the company frames as reaching a subscriber base in the billions. Treat that headline number with care: reach is not revenue, and a memorandum of understanding is not a contract with committed payments.

The Ligado spectrum

In 2025 AST secured long-term rights to L-band spectrum from Ligado Networks. This matters more than it might appear: it gives AST spectrum it controls directly, rather than depending entirely on partner MNOs, and it opens applications — including government and IoT — that partner spectrum would not permit.

The Investment Case, Honestly Stated

ASTS is a pre-revenue company valued on a future it has not yet built. Both the upside and the risk are unusually large, and anyone reading this should hold both in view at once.

• Capital intensity. Continuous US coverage needs dozens of satellites; a global service needs on the order of a hundred. Each is large, expensive and requires a substantial launch. The company must keep raising money, and dilution is a live risk.
• Execution. Deployment has slipped repeatedly. Manufacturing very large, unfoldable spacecraft at rate is an unsolved industrial problem.
• Competition. Starlink’s direct-to-cell service is already live with carrier partners. It is technically less ambitious — narrower bandwidth, messaging-first — but it exists now, and SpaceX launches its own satellites for free.
• Capacity. A satellite covering an enormous area shares its bandwidth across everyone beneath it. Direct-to-device is well suited to filling coverage gaps; it is not a substitute for a terrestrial network in a city, and revenue models that assume otherwise are unsound.