AST SpaceMobile, Inc. is engaged in building the space-based cellular broadband network accessible by standard, unmodified, off-the-shelf mobile devices or 2G/3G/4G LTE/5G devices using low band and middle-band spectrum controlled by mobile network operators (MNOs). The Company's SpaceMobile Service is designed to provide high-speed mobile broadband services to end-users who are out of terrestrial cellular coverage. It is also engaged in designing and assembling its constellation of BlueBird (BB) satellites. BlueWalker 3 (BW3) is its prototype satellite, which is designed to operate directly with standard, unmodified mobile devices. The Company primarily operates in the United States, India, Scotland, Spain and Israel.