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On October 13, 1983, Ameritech Mobile Communications (now AT&T) established the United States’ first cellular network in Chicago, Illinois. Reliable cellular networks make widespread use of mobile technology possible.
 
A cell is a geographic region served by one cell tower. A cell tower, sometimes called a cell site or base station, is a radio transceiver. This means the tower can both transmit radio signals as well as receive them. 
 
A cellular network is simply a connected series of cells. Each cell operates on a distinct radio frequency. This allows mobile devices to access widespread coverage without a disruption in service as the user enters and exits each cell.
 
Today, cellular networks are available all over the world. In the developing world, cell phones are more reliable and popular than traditional landlines. Millions of people rely on cellular networks for personal, business, and health-related communications.
access
Noun

ability to use.

affordable
Adjective

reasonably priced, not expensive.

available
Adjective

ready for use.

business
Noun

sale of goods and services, or a place where such sales take place.

cell
Noun

geographic region served by at least one cell tower, or radio transceiver.

cell tower
Noun

place, usually a tall mast, where electronic communications equipment are placed to create and service a single cell in a cellular network.

cellular network
Noun

connected series of cells, or geographic areas served by at least one cell tower, used for wireless communications.

communication
Noun

sharing of information and ideas.

coverage
Noun

area reached by a communications network.

developing world
Noun

nations with low per-capita income, little infrastructure, and a small middle class.

disrupt
Verb

to interrupt.

distinct
Adjective

unique or identifiable.

establish
Verb

to form or officially organize.

frequency
Noun

rate of occurrence, or the number of things happening in a specific area over specific time period.

geographic
Adjective

having to do with places and the relationships between people and their environments.

health
Noun

condition of an organism's body and mind.

landline
Noun

cable or wire connecting two ground locations.

mobile technology
Noun

tools that are not dependent on a fixed location or set of machinery.

operate
Verb

to control or manage.

participation
Noun

taking part in an activity.

radio
Noun

wireless transmission based on electromagnetic waves.

receive
Verb

to get or accept.

Noun

any area on Earth with one or more common characteristics. Regions are the basic units of geography.

reliable
Adjective

dependable or consistent.

transceiver
Noun

device that can both transmit and receive signals.

transmit
Verb

to pass along information or communicate.

widespread
Adjective

affecting a large area or community.

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