Verizon and AT&T have each announced milestones in making cellphone-to-satellite video calls in partnership with satellite company AST SpaceMobile.

Verizon has completed its first cellphone-to-satellite video call, while AT&T has completed its first using satellites that will be used as part of a commercial network. There’s lining up competition to T-Mobile’s arrangement with SpaceX and Starlink on satellite-to-cell service which launched a public beta for messaging via satellite earlier this month. AT&T and Verizon have said that T-Mobile and SpaceX’s offerings would harm their networks.

Verizon pulled off “a live video call between two mobile devices with one connected via satellite and the other connected via Verizon’s terrestrial network connection,” according to a company press release. In AT&T’s case, “AT&T and AST SpaceMobile have successfully completed another video call by satellite to an everyday smartphone over AT&T spectrum,” per AT&T’s press release.

Both phone companies relied on AST’s constellation of five BlueBird satellites that were launched last September for the tests. AT&T’s initial video call test happened in June 2023.