T-Mobile: AST SpaceMobile Satellites Pose Potential Risk To Cellular Networks

T-Mobile: AST SpaceMobile Satellites Pose Potential Risk to Cellular Networks

Last updated: 2025/11/18 at 5:56 PM

News Room Published 18 November 2025

SpaceX’s partner, T-Mobile, is pressing US regulators to scrutinize AST SpaceMobile, arguing that the company’s satellites risk causing harmful interference to terrestrial cell networks.

On Tuesday, T-Mobile sent a letter to the Federal Communications Commission, which is reviewing AST SpaceMobile’s application to operate a satellite internet service for phones. It urges the FCC to “take no action” on AST’s application “unless and until sufficient information is provided” about the radio interference concerns.

“AST has failed to demonstrate that its proposed SCS [Supplemental Coverage from Space] operations will satisfy the Commission’s stated goal to minimize the risk of interference from SCS services to existing terrestrial networks,” the carrier says.

T-Mobile adds that AST should be required to disclose its maps detailing where the satellite signals will reach in the US, including over traditional cellular sites.

“Accordingly, AST must provide maps that show the overlay of its satellite beams on all geographic market areas, for all relevant elevation angles, including license areas to which it will have access to terrestrial spectrum, and how its satellites will be capable of confining SCS service to those licensed areas,” T-Mobile claims.

It also alleges that AST has been using metrics to underestimate the potential radio interference to user equipment.

(Photo Illustration by Thomas Fuller/SOPA Images/LightRocket via Getty Images)

Texas-based AST SpaceMobile didn’t immediately respond to a request for comment. But the company’s upcoming constellation is poised to compete with SpaceX’s cellular Starlink, which launched through T-Mobile in July.

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AST has partnered with AT&T and Verizon to deliver its own satellite-to-phone service, starting as soon as next year. To do so, the company is preparing to launch dozens of exceptionally large “BlueBird” satellites, with the first prototypes scheduled to fly in the coming weeks. But another crucial step is receiving FCC approval to officially operate the satellite-to-phone service in the US.

The radio interference concerns from T-Mobile are a bit ironic, considering its partner SpaceX has faced and fought back against its own interference claims from other companies. Such disputes are nothing new at the FCC, where satellite operators routinely lobby for spectrum access and regulatory approvals.

SpaceX previously challenged AST’s plans through earlier FCC filings. However, AST has fired back, calling out SpaceX as anticompetitive and criticizing its approach to satellites.