Just because this is more interesting than doing my job:
This is what your phone / Garmin livetrack sends your speed/position/snapchats to:
And this is what your spot / delorme inreach / satphone uploads to:
There’s dozens of commercial and government owned communication satellite networks above us but a few are popular for tracking and private communication services. In the case of the Iridium network there are 96 of them floating overhead (in low earth orbit at about 800km high) covering pretty much all of Earth. There’s also the Inmarsat network of 11 satellites (in geostationary orbit at 36,000km high so you can get away with less satellites) which covers most of the planet apart from the poles. The Spot tracker uses the Globalstar network which covers less of the planet again. Also Spot is one-way (simplex) and cannot receive satellite data.
The cost differences between setting up and maintaining a network of cell phone towers vs a network of bus-sized data centers floating 36,000km over our heads are pretty big for now. However re-usable rockets that can do delivery to orbit are getting along quite nicely and will drop the cost of establishing and maintaining a comms satellite network significantly: