Cellular phones operate using radio waves. With cellular transmission, a local area (ex. a city) is divided in multiple cells. The signals from the cell are transmitted to a receiver and integrated into the regular phone systems. Hence the name of cellular comes from these cells.
SIC 3663 covers cellular radio telephones
SIC 3663 covers makers of cellular radio telephones
4 billion celluar telephones exist in the world :)
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wisp
Cellular Telephones is using the Integrated Services Digital Network ISDN while the Cordless Telephone is using the Public Switched Telephone Network PSTN, same with ordinary telephone.
Cellular telephones use radio waves to transmit and receive signals. These radio waves are a type of electromagnetic wave that allows for wireless communication between devices.
microwaves
as of 2007: 1.5 million lines
then you have a broken phone along with a broken body
Gustave Barth has written: 'Cellular phones' -- subject(s): Cellular radio services industry, Cellular telephones, Cellular telephone equipment industry, Competition
Establishments primarily engaged in manufacturing cellular radio telephones are classified in SIC 3663