according to AST SpaceMobile in a note to the FCC regarding FM1, BlueBird-6:
(1) on December 23, the satellite was launched successfully into non-geostationary orbit and commenced telemetry, tracking, and command transmissions at an orbital altitude of 514-530 km and inclination of 53 (1°), as authorized; and
(2) on December 30, the satellite completed launch and early orbit phase operations.