Phone is a truly important invention of mankind laid the foundation for the development of various information technology IT. It is worth noting that to date telephone drastically changed and is not similar to the one that was still some fifty years ago. Fixed-line telephone network is gradually losing its position and is currently the most popular mobile communications. The reason for this is quite understandable, because the mobile communication provides a unique opportunity to make calls from virtually every corner of the planet.

However, information technology is not standing in one place, thanks to their development of the opportunity, to make calls using the global Internet network, with the cost of long-distance calls has decreased significantly. Also, modern communications operators were offering recently just did a huge amount of variety of services, some of which are very popular because of their convenience. Among these should be noted such a service as a virtual number, which is nothing but a redirection of an incoming call. Virtual room makes it possible to create a subscriber the impression that he is in the same city that he and the caller man. It does not matter what country the world he really is at the moment.