5. Goes back to the beginnings of World War II, is
born by the need of remote communication,
its promoter was the Motorola services
company in the military, it was only a matter
of time before the technologies of Tesla and
Marconi and join gave birth to the radio-
telephone communication.
8. The cell phone is a wireless electronic device that allows to
have access to the network of cellular or mobile telephony.
His principal characteristic is his portability, which one
allows to communicate from almost any place. The
principal function is the communication of voice, as the
conventional telephone.
10. The systems of wireless telephony divide in cells or cells, it
is for this that the devices of mobile telephony know also
as cell phones
11. THE FIRST CELL PHONES
This one is the Motorola
DynaTAC 8000X and
first appeared in 1983,
the cell phone was
used only to
communicate and had
a battery charge lasted
only a few hours.
15. They were evolving in less than one decade they have had
many notable changes: now you assemble several
possibilities of communication and entertainment: one or
two lines, transmission and receipt of voice, etc. In addition
they reproduce music
21. ADVANTAGES
• Talk to whoever you want where you want to walk
• You can quickly call in case of an emergency
• Facilitates communication with people who do not
have close
• It is comfortable
• The can carry around
• You find out what's happening in the world
• You can take photos
• listen to music
• You can send text messages, images or videos
22. DISADVANTAGES
• Walk with a vice if you know not to use limits becomes
• The rates they charge are expensive
• You get used to it and returns you need
• Not all people make good use of the
• By providing information sometimes people do not
reason
24. The use of the mobile telephone, beside communiqués
being kept and in the wave of the 21st century, brings side
effects in which, in case of being informed, we do not even
think. And the worse thing; as the tobacco concerns the
"passive" users and big hurts the environment. Did you know
that the battery of your mobile can contaminate 600.000
liters of water? Did you know that the radiation of your
mobile overcomes 3 million times the radiation of the Sun?
Not speak about the Car Crashes while a "call" was
attended...
26. The cell phone works by means of the union of a network of
stations transmitting-receiving of radio, so called towers;
(base station, which this formed by a tower; a small
building where the equipment of radio is) and a set of
telephone central offices.
