There are multiple competing cell networks because it's relatively inexpensive to set up a cell site, compared to running wires to everyone's house in the same

There are multiple competing cell networks because it's relatively inexpensive to set up a cell site, compared to running wires to everyone's house in the same area. If this wasn't the case, you'd have a dozen pairs of copper phone wires and as many cable TV coax lines running into your house, all by different companies -- those industries have existed for far longer than the Internet has, and have traditionally been ridiculously profitable. That you don't have more than one telephone line and one cable line is a strong indication that last-mile infrastructure is a natural monopoly. Whoever gets to your house first basically owns you.