Cellular telephone is a type of short-wave analog or digital telecommunication in which a subscriber has a wireless connection from a mobile telephone to a relatively nearby transmitter. The transmitter’s span of coverage is called a cell. As the cellular telephone user moves from one cell or area of coverage to another, the telephone is effectively passed on to the local cell transmitter. Cell phones can now be used to transmit SMS messages, emails, and hear enchanting music.
Dr. Martin Cooper, a former general manager for the systems division at Motorola is considered the inventor of the first modern portable handset. Cooper made the first call on a portable cell phone in April 1973. He made the call to his rival, Joel Engel, Bell Labs head of research. Bell laboratories introduced the idea of ce lular communication in 1947 with the police car technology. However, Motorola was the first to incorporate the technology into a portable device that was designed for use outside an automobile. By 1977, AT&T and Bell Labs had constructed a prototype cellular system. A year later, public trials of new system were started in Chicago, with over 2000 trial customers.
