When a caller leaves their voice on your machine, they are charging a physical, tangible item located within your home with a bit of their energy. When you play the message, the energy is released. You can use this in several positive magical ways. For example, the message becomes a bit of that person, so it enables you to better touch them magically, the way a possession or piece of clothing would. You can also use your own message greeting as a protective device, stored within your machine to safeguard your home from incoming negativity.
Phones come in many colors.
Now that you know this, try using them to suit your need. You could wrap it around an object you use in the spell. Or you could recognize the knots and tangles in your phone cord as a part of your own daily life. Over the course of the days, little by little, the cord slowly took its twisted shape. As you untangle the cord, you can untangle the tensions or knots in your own life.