What kind of communication the people out there use?
Us is not known for sat phones usage.
Landline? Here you pay per Minute depend peak/ off peak and local and country wide.
If you want here Landline Internet you get a Phone Number to.
Use a Radio System is not so common but more and more Company who do the Security stuff there use Hytera Radios.
oh i found a list which Tetra Radios got certified:
MOTOROLA Endgeräte
Here is the U.S., land line telephone is still pretty popular. The cable plants are well built out in most rural areas, so getting a telephone line is pretty easy.
Costs are low, $30-$50/month. Many services are no charge for use, free long distance in the U.S. low rates everywhere else. International calls are a few cents per minute.
DSL over the phone lines is pretty common. Speeds are limited and distance from the phone company's equipment is limited. It is not available everywhere.
Cable TV systems can carry phone and internet traffic, but their networks are not built out as far as the telephone companies are.
Satellite based internet is available, often they use a dial up line for your outgoing traffic and the satellite TV system for the incoming traffic. Not perfect, but it does allow useable bandwidth just about anywhere.
Many, many years ago there were parts of the country that were served by microwave to a local service point. Parts of the western US still have similar setups, although fiber optic cable is taking over.
Not that long ago there were parts of the very rural western US that had radio links for phone service. Used to require calling an operator, asking for the remote point, and the radio connection would be set up. Not cellular, but actual point to point radio links.
For the most part, most parts of the country have fiber optic cable somewhere nearby. Back in the 1980's and 1990's, there was a lot of fiber put in the ground linking cities, towns and just about everywhere in between. Fiber cables follow railroad lines, highways, pipelines, etc.
You'd really have to try hard to get away from some communications infrastructure in the US. It can be done. Cellular coverage is not a good example, as the carriers only build out their systems where there is enough usage to cover costs. With a cellular radio site costing anywhere from $500,000 to $1 million, it takes a lot of customers to make that pay back. Costs for the equipment has dropped, but radio site leases are expensive if the cellular carrier does not have it's own facilities.