SOKOINE UNIVERSITY OF AGRICULTURE
DIPLOMA IN INFORMATION TECHNOLOGY
COURSE NAME: MOBILE PHONE REPAIR, TROUBLESHOOTING AND
MAINTENANCE
SUPERVISOR NAME: MR. URIO
CODE: DIT 0214
STUDENT NAME
MISANA DENIS C
REGISTRATION NUMBER
DIT/E/2020/0184
SIGNITURE
1.
Write brief history of mobile phone.
The mobile phone or Cell phones are small electronic devices that are capable of communicating
with each other.
The history of mobile phones covers mobile communication devices that connect wirelessly to
the public switched telephone network.
While the transmission of speech by signal has a long history, the first devices that were
wireless, mobile, and also capable of connecting to the standard telephone network are much
more recent. The first such devices were barely portable compared to today's compact handheld devices, and their use was clumsy
In 1908, Professor Albert Jahn and the Oakland Transcontinental Aerial Telephone and Power
Company claimed to have developed a wireless telephone. They were accused of fraud and the
charge was then dropped, but they do not really seem to have proceeded with production
Technology of mobile phone
The development of metal-oxide-semiconductor (MOS) large-scale integration (LSI)
technology, information theory and cellular networking led to the development of affordable mobile
communications. There was a rapid growth of wireless telecommunications towards the end of the 20th
century, primarily due to the introduction of digital signal processing in wireless communications, driven
by the development of low-cost, very large-scale integration (VLSI) RF CMOS (radiofrequency complementary MOS) technology.
1.
MTS
In 1949, AT&T commercialized Mobile Telephone Service. From its start in St. Louis, Missouri, in 1946,
AT&T introduced Mobile Telephone Service to one hundred towns and highway corridors by 1948.
Mobile Telephone Service was a rarity with only 5,000 customers placing about 30,000 calls each week.
2.
IMTS
AT&T introduced the first major improvement to mobile telephony in 1965, giving the improved service
the obvious name of Improved Mobile Telephone Service. IMTS used additional radio channels,
allowing more simultaneous calls in a given geographic area
3.
Radio Common Carrier
was a service introduced in the 1960s by independent telephone companies to compete against
AT&T's IMTS. RCC systems used paired UHF 454/459 MHz and VHF 152/158 MHz frequencies
near those used by IMTS.
Generation of Mobile phone.
1.
1G – Analog cellular
The first automatic analog cellular systems ever deployed were NTT's system first used in 1979
for car phones in Tokyo and later the rest of the country of Japan, and the NMT system which
was released in the Nordic countries in 1981.
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2.
2G – Digital cellular
In the 1990s, the 'second generation' mobile phone systems emerged. Two systems competed for
supremacy in the global market: the European developed GSM standard and the U.S. developed
CDMA standard
3.
3G – Mobile broadband
As the use of 2G phones became more widespread and people began to use mobile phones in
their daily lives, it became clear that demand for data such as access to browse the internet was
growing
4.
4G- Native IP Mobile Phone
By 2009, it had become clear that, at some point, 3G networks would be overwhelmed by the
growth of bandwidth-intensive applications like streaming media.
5.
5G-Cellular Mobile Phone
5G is the next version of cellular mobile telephone standards. The 5G standards include millimetre-band
radio spectrum to allow data speeds up to 1 gigabit per second, and reduce latency (the processing time
to handle a data transmission) between handset and network to a few milliseconds.
6.
Future mobile phones.
Flexible frames
For a long time now, phone companies have talked of creating a smartphone that is so robust that
it can actually be folded in two by the user.
Educational tools
Some experts believe that in the not-too-distant future, mobiles will change the way we learn and
teach.
Holographic displays
From Star Wars to Ironman, holograms have long been a regular feature in sci-fi and futuristic
fantasy films. But how close are we to being able to having touch-free technology on
smartphones.
7.
Actual advantages of Mobile phone.
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1.
Increased IT security needs - portable devices are vulnerable to security risks, especially
if they contain sensitive or critical business data.
2.
Mobile Phone as a Source of Communications
In my research about the advantages and disadvantages of using mobile phones for youth in society. I
have found that Mobile phones are the best source of communication nowadays.
3.
Mobile Phone as a Source of Information
The new mobile phones have big storage which can store a lot of data in GBs. Students can store
their data information, books, magazines, assignments,
4.
Actual disadvantages of Mobile phone
1.
Health problems
Excessive use of mobile phones causes the health problems such as swelling of the eyes and other
eyesight problems. Mobile phones include mental disorders such as Anger, depression, anxiety, tension,
and others.
2.
Cyberbullying
Cyberbullying means to send, post, or share negative, false, and harmful content about someone else.
Research shows that most students and teenagers got cyberbullied. Cyberbullying puts someone's life in
danger.
3.
Distraction
Sometimes mobile is a disturbing device that creates a distraction between your works. It is seen in
students that are easily distracted from their studies because of mobiles, as the device contains
applications that attract users to enjoy their software.
4.
Costs - new technologies and devices are often costly to purchase and require ongoing
maintenance and upkeep.
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REFERENCE
https://www.uswitch.com/mobiles/guides/future-of-mobile-phones/
https://en.wikipedia.org/wiki/Mobile_phone
https://www.artinstitutes.edu/about/blog/the-history-and-evolution-of-cell-phones
https://www.insider.com/the-history-of-the-cellphone-2018-7
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