When telephone companies were deregulated anyone could buy a pay phone and install it. The phone company would supply a line but the owner had to provide 120 volt to make it operate. The hose & clamps made an interesting no-thread coupling.
It looks like the original installation was shy on support for the EMT with only one clamp (now uunused) on the booth itself but nothing within 3' of the other end. EMT was (according to what we see now) a poor choice. Rather than replace the damaged conduit or even bend it back into a semblance of its original shape, and, because the original fitting would no longer span the joint, the hose and clamping solution is a poor substitute.
As I look at the damage to the conduit, I would say that this conduit was hit by a car bumper. So would IMC even held up? IMC encased in 2" of concrete across the sidewalk or even properly saw cut into and buried under the sidewalk still would not of held up to a car bumper.
EMT and fittings would not have held up for typical damage due to raised elevation above grade and someone just stepping on it.
I also find the strapping of the box for support interesting.