When people talk about “mobile network coverage,” they’re referring to the area in which a given cell phone carrier’s signal works, and the strength of that signal. The mobile network coverage of each company will depend on where it has placed network towers and other network infrastructure.  There are three major carrier networks in the United States—AT&T, T-Mobile, and Verizon—and each one has its own coverage area. You can see each company’s coverage map in the article above.