T-Mobile has launched a registration web page where any voice customer can sign up to potentially beta-test the company's forthcoming satellite coverage service. A limited number of spots are available in the program, so not everyone that signs up may be selected. The service enables two-way text messaging in areas where T-Mobile's land-based cellular network doesn't reach. It's powered by a constellation of 330 (and counting) new Starlink satellites that act like cell towers in space. Unlike some other satellite messaging services, it works with existing phones, doesn't require pointing your phone at a particular spot in the sky, and doesn't require a special messaging app. This step follows formal FCC permission to launch the service less than a month ago.