AST SpaceMobile is a public company that's trying to compete with Elon Musk's Starlink service.AST SpaceMobile (ASTS -2.88%) reached an important milestone in 2023. In 2022, it put a functioning cellular broadband satellite into space, with testing in 2023 proving that the satellite could actually do what management said it would.In effect, AST SpaceMobile has shown it is capable of competing with Elon Musk's much bigger and more established Starlink. Is that enough to make this company a buy, or are invest ...