Here in Warsaw you get cell reception and even LTE on both lines. From what I understand, the transit authority installed antennas along the tunnels and then th

Here in Warsaw you get cell reception and even LTE on both lines. From what I understand, the transit authority installed antennas along the tunnels and then the big four wireless operators maintain their BTS at each station directly, without any specialized underground operator. It used to only work reliably on and near the platforms but nowadays you can watch full HD YouTube videos all along the line with minimal issues.