Cell phone

Millions of people own a cell phone. Cell phones are also called cellular phones, mobile phones, wireless phones etc. Manufacturers of cell phones are Nokia, Motorola, Sony Ericsson, Siemens, Samsung etc.

The name cell phone or cellular phone comes from that the carriers like T-Mobile or Nextel divide a service area into small cells. Each cell has a base station that consists of a radio tower. Cellular calls are made from base station to base station (cell to cell).

In a cell 50 people can be talking on their cell phone at one time. With digital transmission methods more people can talk in one cell area. A TDMA-based system can carry three times as many calls as an analog system.

Cell phone history

The telephone was invented by Alexander Graham Bell in 1876
Wireless communication can trace its roots to the invention of the radio in the 1880s
In 1973 Motorola made a portable device that you could call with.
By 1987 cellular telephone subscribers exceeded one million