SpaceX won't build large cell towers but plans small base stations across US.

Elon Musk reveals plans for Starlink Mobile, leveraging EchoStar spectrum to create a 100x better network. Legacy carriers' stocks slip.

Aug 4 : SpaceX's ambition to build a full-fledged mobile service rattled investors in the U.S. wireless sector on Tuesday, as the company outlined plans that could eventually pit…