Direct-to-cell (D2C) satellite service lets an ordinary, unmodified phone connect to a satellite — no dish, no special handset, no extra app. The satellite behaves like a cell tower in space, so your phone sees it as just another signal. It is the technology behind “texting from the middle of nowhere,” and it is rolling out fast across the mobile industry.
How it works
Low-Earth-orbit (LEO) satellites carry very large antennas and transmit on the same radio bands your phone already uses. When a satellite is overhead, your phone links to it the way it would to a terrestrial tower; the satellite then relays your traffic to a ground station and into the normal mobile network. Because these satellites orbit a few hundred kilometres up and move quickly, a given one is only above you for a few minutes at a time.
Who is building it
- AST SpaceMobile — the BlueBird constellation, partnered with carriers like AT&T and Verizon. See our AST SpaceMobile coverage guide.
- Starlink Direct to Cell — SpaceX with T-Mobile and other carriers worldwide. See Starlink Direct to Cell availability.
- Lynk Global — “cell towers in space,” with deals across many mobile operators.
- Apple / Globalstar — Emergency SOS via satellite (emergency messaging, not general D2C).
What it can do today
Most services start with texting, then add basic data and, eventually, voice as constellations grow. Coverage today is intermittent: until there are enough satellites for one to always be overhead, connectivity at any single point comes and goes as satellites pass.
Why availability comes and goes
This is the part most coverage maps miss. A LEO satellite is a moving target, so the useful question is not just “is there coverage here?” but “when is a satellite overhead here?” That window — its start, peak elevation and duration — is exactly what GroundOrbit computes from public orbital data. You can see live satellite tracks on the map or get pass and availability windows for any coordinate from the satellite API.