AST SpaceMobile (ASTS 0.86%) has a great story behind it. And the story is about to take an important turn for the better. But is it the smartest investment you can make today? That's a harder question to answer and the answer depends on both your opinion and Wall Street's opinion of the business.What does AST SpaceMobile do?AST SpaceMobile is in the process of building a satellite network that will allow normal cellphones to have broadband connections "anywhere" on the planet. The word anywhere is in quote ...