How does this work? Where does the fiber to the towers come from?
A lot of time from the local cable company
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Plus Verizon and AT&T, who provided their own fiber backhaul for their respective wireless services in many circumstances. But not always, the Verizon tower near where I work is fed by fiber from Charter. It was cheaper to use Time Warner for backhaul than it was to user their own fiber. Even more ironic is that T-Mobile, who constantly rags on Verizon, AT&T and the cable companies has to outsource their fiber backhaul to the same companies they rag on since they don't own any of their own fiber in the US, although that changed a little bit with the acquisition of Sprint, but Sprint didn't have a ton either.