AST SpaceMobile successfully tests cell-to-satellite calls transmitting video

According to press releases from both Verizon and AT&T on February 24, 2025, each has successfully tested cellphone-to-satellite video calls using the first set of satellites in AST SpaceMobile’s BlueBird satellite constellation. From ATT:

AT&T and AST SpaceMobile have successfully completed a video call by satellite over AT&T spectrum using the BlueBird satellites launched last September. These are the same satellites that will be used to start commercial service.

From Verizon:

Verizon and AST have yet again pushed the boundaries of what can be done with mobile devices by successfully trialing a live video call between two mobile devices with one connected via satellite and the other connected via Verizon’s terrestrial network connection.

The satellites will essentially act like cell towers in space, filling in all dead spots not reached by ground-based towers.

AST’s constellation is competing with Starlink, which has signed T-Mobile for its service. In addition, Eutelsat-Oneweb has just successfully tested using its satellite constellation for the same purpose.

I suspect that in time, when these satellite systems have been thoroughly tested and have become operational, they will allow these phone networks to begin decommissioning their cell towers on Earth, thus reducing their costs significantly and thus lowering the cost to their customers.

Eutelsat-Oneweb uses its satellite constellations to test technology for phone-to-satellite capabilities

The communications company Eutelsat-Oneweb announced today that it has successfully tested the technology that would allow smartphones to use its satellite constellations as orbiting cell towers in order to eliminate dead zones in their ground-based systems.

Based on the press release, it is unclear whether the tests actually included a cell phone.

The trial used Eutelsat OneWeb satellites, with the MediaTek NR NTN test chipset, and NR NTN test gNB provided by ITRI, implementing the 3GPP Release 17 specifications. Sharp, Rhode & Schwarz provided the antenna array and test equipment and the LEO satellites, built by Airbus, carry transponders, with Ku-band service link, Ka-band feeder link, and adopt the “Earth-moving beams” concept. During the trial, the 5G user terminal successfully connected to the 5G core via the satellite link and exchanged traffic. [emphasis mine]

That user terminal might have been a smart phone, or it could have been an engineering test terminal.

Either way, Eutelsat-Oneweb appears to be aggressively trying to enter the competition for cell-to-satellite business, competing with the systems already operational from Starlink and AST SpaceMobile.

Chinese pseudo-company GalaxySpace successfully tests its cell-to-satellite system

The Chinese pseudo-company GalaxySpace yesterday successfully proved its its cell-to-satellite technology works, using a smartphone to connect with one of its recently launched satellites.

At 10:28 a.m., a satellite from the constellation passed over the conference venue in the Beijing Economic-Technological Development Area. On-site staff used their mobile phones to connect to the satellite via a terminal device installed on the rooftop. Through a gateway station in Beijing, they established a connection with personnel in Beijing and Thailand.

Calling Thailand was significant because it signaled the signing of a deal with a major Thailand telecommunications operator to provide this service to that country.