Old telephone cables are being pulled from the ground to make room for new fiber optic cables in Helsinki Finland. Bye bye PSTN. According to plans they will be gone in few years.
Here they are pulling out the old telephone cable.
Freshly pulled out “filled liquorice”.
Old telephone wires to carry PSTN, ADSL and audio become outdated and are replaced with fiber. I walked past the site and decided to take a closer look at the underground infrastructure.
Some information on plan to get rid of copper lines in Finland from few years back and updates in comments
Those old copper phone lines will be replaced with fiber optic cable and 4G/5G mobile communications.
Huge telephone cable replaced with fiber earlier posting from same location
Now they seem to be putting in this type of fiber optic cable
This is the device used to pull the fiber cable to the underground tubes
The advantage of fiber is much faster data rate and hopefully system that is not damaged easily by lightning. The cost of the network maintenance is said to be cheaper with fiber and 4G connections (maintaining copper is expensive).
Disadvantage is that so much for phone system that would work on power blackout. Usually cellular networks and fiber do not have so extensive battery backup arrangements as old telephone network used to have.