Starlink Direct to Cell
Strong doubts about voice service being useful, assuming 2-4mbps per 50 km diameter spot.The point of cellular is frequency reuse. If your cell is huge that's one channel blocked for that entire area. You can't reuse the it within that area to serve more terminals with more bandwidth. So the system capacity will suck.Number of simultaneous voice users would be limited to the capacity of a single channel for 2000 sqkm. Don't hope for much.