Why is telephone cable like a Spring?

The telephone set is usually placed at a designated position, while people have to move around.

The Spring-like design enables people to manage more other work when answering the phone call, such as looking at the computer screen to find out desired information.

By that, people are free to behave.

A spring-like cable takes less space than a normal cable, and is more hygienic, because it will not even drag to the floor like a straight cable.