Will Satellites Replace Cell Towers? 2026 D2D Guide

In April 2023, AST SpaceMobile completed the first two-way voice call between unmodified smartphones through a satellite in low Earth orbit, using its BlueWalker 3 test satellite: no cell tower, no specialized antenna, no satellite phone. Just a regular smartphone connecting directly to a spacecraft hundreds of miles overhead.

As of September 2026, satellite-to-smartphone service is real but still early. SpaceX's Starlink runs satellite texting with carriers such as T-Mobile, and Ukraine's Kyivstar reported more than 6 million users of the service in July 2026. AST SpaceMobile reported 13 spacecraft in orbit in August 2026 (its BlueWalker 3 test satellite and 12 BlueBirds), is preparing beta service with partner carriers, and is targeting about 45 BlueBird satellites in orbit in early 2027.

This is direct-to-device (D2D) satellite technology, and it is poised to be the most disruptive force in telecommunications since the smartphone itself.

The Coverage Gap

Despite decades of cell tower construction, most of the Earth's land surface, and almost all of its oceans, has no terrestrial cellular coverage. Most people who are offline actually live within coverage and do not use it, but GSMA estimates that about 3% of the world's population still lived outside mobile broadband coverage entirely at the end of 2025.

The economics explain why. Building a cell tower costs $150,000-$350,000, plus $30,000-$50,000 per year in maintenance and backhaul. In rural and remote areas, there simply aren't enough potential subscribers to justify the capital expenditure. The result: a permanent coverage gap that terrestrial infrastructure will never close.

Satellites can close it. A single D2D satellite in LEO can cover a service area the size of Texas, reaching every smartphone within its footprint without any ground infrastructure. The economics flip: instead of building thousands of towers to reach scattered rural users, you deploy a constellation that covers the entire planet from orbit.

How Direct-to-Device Works (Technical but Accessible)

The core technical challenge of D2D is straightforward to state and extraordinarily difficult to solve: a standard smartphone transmits at roughly 200 milliwatts (0.2 watts), a signal so weak that it wasn't supposed to be detectable from orbit. Traditional satellite phones solve this with large external antennas and high-power transmitters. D2D satellites solve it differently.

The Giant Antenna Approach

AST SpaceMobile's first-generation BlueBird satellites deploy an enormous 693-square-foot phased array antenna that unfolds in orbit, and the Block 2 BlueBirds launching in 2026 carry larger arrays still. This massive antenna provides enough gain (signal amplification) to detect the tiny signal from a standard smartphone on the ground. Think of it like a satellite with a giant ear, listening for whispers from 450 miles below.

The antenna works in both directions: it can also transmit a focused, high-power beam back to the smartphone, delivering broadband-speed data (up to 10-20 Mbps per user) without requiring any modification to the phone's hardware or software.

The Protocol Layer

D2D satellites operate using standard 4G LTE and 5G protocols, the same wireless standards used by terrestrial cell towers. From the smartphone's perspective, the satellite appears as just another cell tower. The phone connects using its existing cellular radio, authenticates through its existing SIM card, and routes data through its existing carrier account. No app download, no hardware modification, no special mode.

This is the critical differentiator. Unlike satellite phones (Iridium, Globalstar) that require specialized hardware and separate subscriptions, D2D works with the billions of smartphones already in people's pockets.

The Latency Question

LEO satellites orbit at 300-600 km altitude, producing round-trip latency of approximately 20-40 milliseconds, comparable to a long terrestrial fiber route and well within acceptable limits for voice calls, video streaming, and most applications. This is dramatically better than the 600+ ms latency of geostationary satellite systems like ViaSat and HughesNet.

AST SpaceMobile: First to Market

AST SpaceMobile (NASDAQ: ASTS) is building the broadband-to-phone approach. The company's milestones so far:

• 2022: Launched BlueWalker 3, a test satellite
• 2023: First two-way voice call (April) and first 5G connection (September) between a satellite and unmodified smartphones
• 2024: Launched the first five commercial BlueBird satellites (September), each with a 693 sq ft antenna array
• 2025-2026: The first Block 2 BlueBird launched on India's LVM3 (December 2025); a second was lost when New Glenn's upper stage left it in too low an orbit (April 2026); six more launched on Falcon 9 in June and August 2026, giving 13 spacecraft in orbit including BlueWalker 3. The company says it is preparing beta service with partner carriers
• 2027: About 45 BlueBirds in orbit is the company's early-2027 target; global coverage needs many more satellites

Carrier Partnerships

AST SpaceMobile's business model is a wholesale partnership with existing mobile carriers. Rather than selling directly to consumers, AST provides satellite capacity to carriers who bundle it into their existing plans. Current partnerships include:

• AT&T: Lead U.S. partner. AT&T subscribers in eligible areas are meant to see satellite coverage as a seamless extension of their existing service: the phone simply connects to the satellite when no tower is available.
• Verizon: A second U.S. carrier partner since May 2024, when it committed $100 million to the partnership.
• Orange: Partnership covering Europe and Africa, representing over 280 million subscribers across 26 countries.
• Additional partners: Agreements with Rakuten (Japan), Vodafone, Globe Telecom (Philippines), Telkomsel (Indonesia), and others. AST said in August 2026 that it has signed more than 60 mobile operators that together cover over 3 billion subscribers.

The Business Model

The revenue model is a wholesale fee paid by carriers, which share revenue from customers who use satellite coverage. How large that becomes depends on how many satellites fly, how much carriers charge, and how many customers pay for coverage they use only occasionally. Published forecasts vary widely; none has been tested by a year of full commercial service yet.

Competition: Starlink Direct to Cell (Starlink Mobile)

SpaceX is not ceding the D2D market to AST SpaceMobile. Starlink's direct-to-cell service, now marketed as Starlink Mobile, takes a fundamentally different technical approach:

• Smaller antennas, more satellites: Instead of AST's approach of large antennas on fewer satellites, SpaceX flies dedicated direct-to-cell satellites alongside the rest of the Starlink constellation (about 11,000 active satellites in total, September 2026). This sacrifices per-satellite performance but provides denser coverage.
• Text first, data next: T-Mobile launched satellite texting on Starlink in 2025, with data for selected apps following. Carriers abroad, including Kyivstar in Ukraine, run the service too. SpaceX's June 2026 IPO prospectus says its next-generation Starlink Mobile satellites, combined with the wireless spectrum it bought from EchoStar, are designed to deliver connectivity on par with terrestrial mobile networks.
• Scale through carriers: Because the service rides on carriers' existing customers and phones, it reached millions of users before AST's constellation was large enough for continuous service.

The competitive dynamic is nuanced. AST SpaceMobile offers higher bandwidth per user (voice + data from day one) but has fewer satellites and limited coverage until its full constellation is deployed. Starlink offers broader initial coverage (leveraging its massive existing constellation) but starts with lower-bandwidth services. Both approaches have merit, and the market may ultimately support both.

Apple's Emergency SOS: The Gateway Drug

Apple's Emergency SOS via Satellite, available on iPhone 14 and later models through a partnership with Globalstar, demonstrated consumer demand for satellite connectivity, but it's limited to emergency messages and location sharing. It proved the concept; D2D delivers the full experience.

What This Means for the Telecom Industry

D2D satellite technology doesn't just fill coverage gaps; it fundamentally changes the economics of the telecommunications industry:

The End of the Tower Buildout

Carriers have spent decades building out tower networks in progressively less economical locations. D2D eliminates the need to extend terrestrial infrastructure to the final 10-20% of coverage areas, potentially saving the global telecom industry hundreds of billions in avoided capex. Why build a tower serving 200 rural subscribers when a satellite can cover the same area from orbit?

Disaster Resilience

When hurricanes, earthquakes, or wildfires destroy cell towers, satellite D2D provides an infrastructure-independent backup. The satellite constellation continues operating regardless of ground conditions. For emergency services and disaster response, this is transformative.

Maritime and Aviation

D2D extends to ships and aircraft, where passengers and crew can use their existing smartphones without specialized maritime or aviation satellite systems. This threatens the existing (and expensive) in-flight connectivity market served by Gogo, ViaSat, and others.

Emerging Markets

In Africa, Southeast Asia, and Latin America, D2D could leapfrog terrestrial infrastructure entirely, similar to how mobile banking (M-Pesa) leapfrogged traditional banking in Kenya. Hundreds of millions of people could gain smartphone connectivity for the first time without waiting for tower construction that may never come.

Technical and Regulatory Challenges

D2D is not without obstacles:

• Spectrum sharing: D2D satellites use the same frequency bands as terrestrial cell towers, creating potential interference issues. The FCC adopted a "supplemental coverage from space" framework in March 2024, but each operator still needs its own authorizations and interference limits.
• Capacity limits: Each satellite can serve a limited number of simultaneous users. In densely populated areas, the capacity per user drops significantly. D2D is complementary to towers in urban areas, not a replacement.
• Capital intensity: Deploying a full constellation costs billions of dollars. AST SpaceMobile has funded its build with repeated equity and debt raises, and launch problems push revenue further out: in April 2026 a New Glenn upper-stage failure left BlueBird 7 in too low an orbit, and the satellite was deorbited.
• Regulatory variation: Each country has its own spectrum allocation and telecom regulations. D2D requires regulatory approval in every market it enters, a time-consuming process.

Who Is Exposed to D2D

These are the companies whose results depend most on D2D. This is a description, not investment advice:

• AST SpaceMobile (ASTS): a pure-play D2D company whose revenue depends on getting enough BlueBirds into orbit for continuous service.
• Globalstar (GSAT): Apple's satellite partner for Emergency SOS; Apple agreed in 2024 to take a 20% equity stake. In April 2026 Amazon agreed to acquire Globalstar (closing expected in 2027). Provides emergency messaging, with potential expansion to broader D2D services.
• SpaceX: Starlink Mobile is one growth line within SpaceX's broader satellite business, which it described in its 2026 IPO filing.
• Carriers: AT&T (T), T-Mobile (TMUS), and Verizon (VZ) use D2D as a coverage extender; how much it earns them is not yet disclosed separately.

The 2030 Outlook

By 2030, the D2D landscape is likely to look very different from today:

• Multiple competing constellations from AST SpaceMobile, SpaceX, and potentially Amazon Leo (formerly Project Kuiper) and Chinese providers
• Standard inclusion of satellite connectivity in all flagship smartphones
• Regulatory frameworks for D2D spectrum sharing established in most major markets

The cell tower won't disappear; it will remain essential for high-density urban areas where satellite capacity is insufficient. But for the large share of the Earth's surface with no tower in reach, and for the people who live, work and travel there, the satellite is becoming the tower. That's not a vision for the distant future. It's happening now.

Track D2D satellite deployments, constellation coverage maps, and related company metrics through the SpaceNexus Satellite Tracker. Monitor AST SpaceMobile, Globalstar, and carrier stocks in Market Intelligence, and follow spectrum regulatory developments in Compliance Hub.