AT&T and AST SpaceMobile Complete First Handoff Between Cellular and Satellite Networks

AT&T and AST SpaceMobile said they completed what the companies describe as the telecom industry's first successful handoff between a ground-based cellular network and a direct-to-device satellite system. The demonstration took place on October 21, 2026, outside Granite Falls, Washington, at 8:15 a.m. Pacific time, and the companies announced the result this week.

The test moves a live connection from a terrestrial cell site to a satellite and back without forcing the user to change settings or restart a session. Earlier trials by the same partners carried voice calls, text messages and video calls over AST SpaceMobile's BlueBird satellites using ordinary smartphones. The new step addresses a different problem: transferring an active connection between the two networks as a subscriber crosses out of ground coverage.

Milliseconds instead of seconds

Ericsson supplied the combined radio and core technology for AT&T, including intelligent network automation that coordinates the transfer. According to the companies, this reduced transition times between the ground and satellite networks from seconds to milliseconds. Nokia provided the radio access technology and mobility software running AST SpaceMobile's space-based network, which is designed to keep service continuous as users move between terrestrial and satellite coverage.

The companies frame the satellite layer as a complement to, rather than a replacement for, the existing cellular footprint. AST SpaceMobile's network is intended to extend coverage to remote and hard-to-reach areas while AT&T's towers continue to carry the bulk of traffic. The handoff is a prerequisite for that model to work, because a call that drops at the edge of coverage defeats the purpose of adding satellite capacity.

AT&T's senior vice president of network, Robert Walters, called the handoff a significant milestone but not the finish line. He said the operator is working toward real-world beta services and eventually commercial service, combining its fiber footprint, its terrestrial wireless network and partner connectivity. Walters also said AI is embedded across the operator's network and operations to anticipate demand and improve performance.

What it means for network careers

For engineers, the test points to a shift in the skills that operators and satellite providers need. Non-terrestrial coverage depends on network engineering methods that treat ground and space segments as one system: mobility management, handover logic, core network integration and automation rules that decide which link a device should use. The work spans radio planning, core signaling and software that coordinates between vendors.

The test also raises the profile of roles that sit between traditional cellular teams and satellite operations. Specialists who can model coverage gaps, tune handover thresholds and validate service continuity across two very different radio environments are likely to be in demand as operators move from trials toward consumer offerings. Automation tooling, including the intelligent controllers now being deployed by major carriers, is part of the same trend.

What to watch next

The next markers are beta trials with real customers and the commercial launch that AT&T says it is working toward. Neither company gave a date for either phase. Regulators will also matter, since direct-to-device service depends on spectrum arrangements and approvals that govern how satellite systems interact with licensed terrestrial networks. The companies have not disclosed how many sites or satellites will take part in the next round of testing.

For now, the announcement establishes that a connection can pass between a cell tower and a satellite without a visible interruption. Whether that holds at scale, across varied terrain and under heavy load, is the question the coming trials are meant to answer.