Re: Not-so-hidden subsidies
Cables and holes aren't generally the mobile company's job - the backhaul is usually provided by Openreach, Virgin, or one of the dedicated business network companies. Of course the cost of that would increase if the overheads did, but it would increase for everyone, not just mobile co's
Planning permission for towers is abbreviated only in certain cases. A remarkable percentage have to go to appeal to get built. (and the same folk who object sometimes complain about lack of a decent mobile signal!)