What is direct-to-cell satellite service?

How it works

A direct-to-cell satellite talks to a standard phone on frequencies the handset already supports. No dish or special device is needed. In the United States, service on a terrestrial carrier's spectrum is what the Federal Communications Commission (FCC) calls supplemental coverage from space (SCS). Under rules adopted on March 14, 2024, a satellite operator that leases spectrum from a terrestrial carrier can apply to serve that carrier's customers outside its coverage area. The agency called the rules the world's first such framework.

3GPP, the body that writes cellular standards, describes several technical hurdles. First, satellites in low Earth orbit move fast, which produces larger Doppler shifts and faster changes in signal delay. Second, a handset's limited transmit power constrains the uplink. 3GPP's Release 17 specifications, frozen in June 2022, were the first to include normative requirements for such non-terrestrial networks.

Why it matters

The FCC said its framework is meant to keep smartphone users connected where no terrestrial mobile service exists. It said such connections can be lifesaving in remote places. Light Reading reported that 93,700 mobile users sent 287,000 text messages over T-Mobile's satellite service during central Texas floods in early July 2025.

Where things stand in 2026

T-Mobile launched its T-Satellite service nationwide in July 2025 as a messaging product using more than 650 Starlink satellites. That followed a beta test with nearly 2 million users.

On April 21, 2026, the FCC approved AST SpaceMobile's 248-satellite constellation to provide SCS on low-band spectrum held by AT&T, Verizon and FirstNet. Light Reading reported in mid-July 2026 that AST had nine satellites in orbit and had moved its target of about 45 from 2026 to early 2027.

SpaceX plans to start a mobile satellite service in the first half of 2028, its chief financial officer, Bret Johnsen, said in September 2026. An earlier target was end-2027. He called the service a "full 5G quality service". He said it would use spectrum acquired from EchoStar and new satellites launched on Starship. Executives at T-Mobile, Verizon and AT&T argued the same month that satellite service cannot substitute for ground networks, particularly indoors and in cities and suburbs.

On October 2, 2026, those three carriers formally established a joint venture for direct-to-device services, first announced in May 2026. Via Satellite reported that the venture is not exclusive. It said the carriers called for competition among satellite providers.