Communication equipment transmits or receives information over a distance by electrical or electromagnetic medium in a variety of forms such as radio, telegraph, telephone, data communication and computer networking communication system support wireless and wire lined communication between wireless and wire lined communication device. Speakerphone are telephone terminal devices, which a user uses to converse over a telephone network with another party without the use of handset. Voicemail systems are used for answering telephone calls directed to a person, who is unavailable.
Telephone call center are call management system that distribute phone calls. An intercom short for intercommunicating telephones is a communication system linking different rooms within a building or different places. A telephone answering machine is an electronic device that automatically answers an incoming telephone call plays pre recorded message and records a message that the caller leaves. A video phone is a system for bi-directionally transmitting moving pictures and speech of minimum equality over conventional telephone lines. The mobile phones are a portable electronic device used for mobile voice data communication over a network of specialized base station, known as cell phones. Nokia is a currently the world’s largest manufacturer of mobile phones. Other major mobile phones manufacturers include samsung, motorola, Sony Ericson and L.G.The most commonly used data application on mobile phone is S.M.S text messaging.Mobile generally obtain power from batteries, which can be recharged from a U S B part or from main power. An increasing number of countries particularly in Europe now have more mobile phone than people.

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