Telecommunication is a method for transmission of information over distances to communicate. In previous times, telecommunications used the visual signals, such as smoke signals, signal flags and audio messages via coded drumbeats or sent by loud whistles, etc. In present era of electricity and electronics, telecommunications now also includes the use of electrical devices such as telegraphs, telephones, and, the use of radio and their associated electronics, and the Internet.
With latest changes in technology the telecom industry also update itself with new equipments and devices. The recent change in the telecom sector has been observed by introduction of smart phones and tablets.