Wireless VoIP phone systems provide incredible convenience and savings to their users. The underlying technology relies on the Internet to deliver voice data packets from one end to the other. This is much cheaper than using the old lines, especially if the people talking are on different countries. Long distance calls are notoriously expensive such that conversations are almost always rushed. VoIP makes it possible for both parties to relax and slow down.
Being a wireless system, on the other hand, allows users to have freedom of movement while talking on the phone. They are not constrained to their desk. If something comes up which requires them to check information elsewhere, then they can bring the unit with them while they do. There is no need to put the other person on hold or hang up while they do their work.