Infrastructure sharing is entering a new era with the prospect of becoming active and more deeply entwined in 5G networks, especially in more rural areas. The practice is almost as old as cellular itself but faced with the financial pressure and complexities of 5G, operators are turning more to collaboration and co-construction as networks extend to more places and market niches. New business models have sprung up to meet the surging demand, especially around neutral hosts serving multiple operators without supposed partiality. At the same time, operators are seeking to maintain control and competitive edge in what they consider critical areas such as their urban heartlands, although even there networks may be shared, at least at the backhaul level where…