Amazon has decided to enter (or at least explore) the world of low-earth-orbit (LEO) satellite internet. Traditional geosynchronous comms satellites stay over the same spot on earth and cover a wide area, so you only need a few for global coverage, but they're a long way away (21k KM up), so you need a dish to pick up the signal, and of course one satellite has limited bandwidth. At low orbit (100-2k KM), the range is much less so theoretically the user terminal can be much smaller (though still won't work indoors) but you need a LOT of satellites to guarantee one will be overhead at any given time. Iridium has 66 just for voice and limited data - in the new generation, enabled by cheaper launch and components, Amazon is apparently looking at 3k and Space X has approval for 12k. The theory of all of these is home broadband in developed markets and backhaul in developing markets, either for cellular towers or local wifi (this is still NOT a good way to connect a mobile phone directly).