Due to the advancements of technology in recent years we have seen a great number of improvements being made to the telephone.
We saw the introduction of Cordless telephones, which was first invented by Teri Pall in 1965. It consisted of a base unit that connected to the land-line system and also communicated with remote handsets by low power radio.
We also saw the introduction of mobile phones. Modern mobile phone systems are cell-structured. Radio is used to communicate between a handset and nearby cell sites. When a handset gets too far from a cell site, a computer system commands the handset and a closer cell site to take up the communications on a different channel without interrupting the call.
Some mobile telephones, especially those used in remote locations, where constructing a cell network would be too unprofitable or difficult, instead communicated directly with an orbiting satellite.
Recently mobile phones have become digital allowing them to use a broadband Internet connection to transmit conversations as data packets. It is also known as Internet telephony or Voice over IP (VoIP), digital telephony, which uses a disruptive technology that is rapidly replacing traditional telephone networks.