Tue, 03/14/2023 - 07:16 Tech Insider SpaceX founder Elon Musk and T-Mobile CEO Mike Sievert on stage during a T-Mobile and SpaceX joint event in August.Michael Gonzalez/Getty Images Tags Tech Insider, News, Trending UK, Tech, Starlink, spacex, Elon Musk, Internet, Cell Phones, T-Mobile, Phone, WiFi Source Elon Musk's SpaceX plans to test Starlink and T-Mobile's cell phone service thiā¦