I lived in a building in Norway that had phone lines from like 1924. As it was declared as historic it was very difficult to dig newer cables. So ISP tried to use the old cables. At best one can get 10 MBit/s with a lot of packet loss. Eventually everyone switched to mobile internet. With 5g and stationary antenna it was possible to get 300 MBit/s with no packet loss and sub 10ms ping to local servers.