PRESENTATION FOR YOUR NEXT COMPUTER LECTURE

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4.  Alexander Graham Bell invented telephone and 1878
he made the first phone call.
 Motorola introduced some of its first cell phones
during the 1980s.
 Those phones were completely different from the
devices we have today since from no side they were
cost effective and handy.
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5.  The first call was made
from a mobile phone was
made 40 years ago!
 Mobile phones have come
a long way from an
enormous $3,995 heavy
brick to present devices.
40 Years!
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6.  The concept of
Radiophones
were introduce
early days of
1920s and they
were used by
the Police in
1940s.
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7.  Cell phones were first
made available to the
public in 1984.
 At the same year,
radio telephony was
introduced on
airplanes for air traffic
security
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8.  In 1950, Radiophones were used in Second
World War.
 In 1957 a young Soviet radio engineer Leonid
Kupriyanovich from Moscow created a
portable mobile phone, and named LK-1.
 he first fully automated mobile phone system
for vehicles was launched in Sweden in 1960
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9.  Martin Cooper made the first cellular phone
call to Dr. Joel S. Engel of Bell Labs.
 In 1974 SRA releases a mobile telephone
whose weight was 3 kilograms, Its dimensions
were 13 x 1.75 x 3.5
 Cell phones became popular and received
demand from the public during the 1983 to
1989 period .These phones powered by the car
battery with a DC outlet.
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10.  During the 1990s, the technology on the cell
phones was called 2G or second generation.
 These systems worked on CDMA, TDMS, IS-
136 and GSM.
 2G cell phones had a faster network which
functions on radio signals.
 The 2G cell phones were smaller, around 100 to
200 grams, these were hand-held and were
portable
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11.  The phones we used nowadays are the third
generation phones.
 3G was soon launched after 2G.
 3G cell phones have set standards which the
network providers need to follow, these cell
phones could also message other users via SMS
(Short Messaging service).Also these Phones
could do email, access the internet, stream live
videos, radios and use the Wi-Fi.
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13.  The Сеll рhоne is а latest invention of the 21st
century. It is still а new device in many
countries.
 People do not leave their homes without their
Сеll рhоne.
 It's а convenient way to communicate and have
made the communication easier.
 Cell phones are great invention , it has many
advantages and disadvantages.
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