2. Public Use VoIP telephones at home allow people to place calls anywhere in the world, the cost of running a VoIP phone is less than a local telephone company, and you can keep your existing phone number. It mainly works by paying a monthly subscription fee for unlimited domestic calls.
3. Private Use Skype is a software application that allows users to make peer-to-peer voice and video calls over the Internet for free at anytime. Skype is a very useful business tool which is used to stay in touch with clients worldwide.
4. Corporate Use In 2011, Microsoft bough Skype for $85. billion to give them a boost in the competitive communications market. It gave them the chance to develop a must-have application when the windows phone is released to compete against software giant Apple and their communication platform, Facetime.