One of the most important and decisive elements of having a good ADSL that goes at high speed, is to be able to use it to serve you as an Internet phone, and thus be able to make calls over the Internet instead of the traditional method.
In this way it will be much cheaper to make all the calls you want to make, and for that there is this program called Walkie Talkie, which is a simple tool very similar to the popular Skype that will allow you to talk privately through the computer, and keep Free conversations as if it were a real walkie talkie.
Of course, the great drawback of Walkie Talkie is that sometimes the voice (both the one that emits and the one that is received) is not of very good quality.
You can free download Walkietalkie 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.