THE HISTORY OF MOBILE |
The First Mobile Phone Call (1973)
The history of mobile devices is a fascinating journey that has
revolutionized the way we communicate, work, and access information. Let's take
a brief look at the key milestones in the development of mobile technology:
- The
First Mobile Phone Call (1973): On April 3, 1973, Martin Cooper, an engineer
at Motorola, made the first-ever public mobile phone call. He used a prototype
of the Motorola DynaTAC 8000x, a large and heavy handheld device, to call a
rival telecommunications company.
- First
Commercial Mobile Phone (1983): The Motorola DynaTAC 8000x became the first
commercially available mobile phone in 1983. Though it was expensive and had
limited features, it marked the beginning of the mobile phone era.
- Introduction
of GSM (Global System for Mobile Communications) (1991): GSM, a standard
for digital cellular networks, was introduced in 1991. This enabled international
roaming and interoperability between different networks and devices, promoting
global adoption.
- The
Rise of Nokia (1990s-2000s): Nokia became one of the dominant players in
the mobile phone market during the 1990s and early 2000s, with its iconic models
like the Nokia 3310, known for its durability and long battery life.
- The
Emergence of Smartphones (Late 1990s-2000s): The concept of smartphones,
which combined phone capabilities with PDA (Personal Digital Assistant) features,
started gaining popularity. Early models like the Nokia Communicator and BlackBerry
devices paved the way for more advanced smartphones.
- Apple
iPhone (2007): The introduction of the Apple iPhone in 2007 revolutionized
the smartphone industry. Its touch-screen interface and the App Store concept
transformed how people interacted with their mobile devices and created a thriving
app ecosystem.
- Android
OS (2008): Google's Android operating system was introduced in 2008, providing
an open-source alternative to iOS. Android smartphones from various manufacturers
quickly gained popularity, leading to significant competition in the smartphone
market.
- App
Ecosystem Growth: The introduction of app stores, particularly Apple's
App Store and Google's Play Store, led to an explosion of mobile applications.
Developers could now create and distribute apps to a global audience, further
enhancing the capabilities of smartphones.
- 4G and
Mobile Internet: The rollout of 4G (fourth-generation) mobile networks
brought faster data speeds and improved mobile internet connectivity. This
fueled the growth of video streaming, social media, and online services on
mobile devices.
- 5G Technology
(Late 2010s-2020s): The deployment of 5G networks started in the late 2010s,
promising even faster data speeds, lower latency, and improved network capacity.
5G is expected to power advancements in augmented reality, virtual reality, the Internet of Things (IoT), and other emerging technologies.
- Beyond
Smartphones: The mobile landscape continues to evolve with the emergence
of other mobile devices such as tablets, smartwatches, and various IoT gadgets,
expanding the concept of mobile computing.
Mobile technology has come a long way since its inception, and it continues to shape the way we live and interact with the world around us. As technology continues to advance, we can expect even more exciting innovations in the mobile space in the years to come.
Mobile phone
Two decades of evolution of mobile phones, from a 1992 Motorola 8900X-2 to the 2014 iPhone 6 Plus
A mobile phone (cellphone, etc.) is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area, as opposed to a fixed-location phone (landline phone). The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides access to the public switched telephone network (PSTN). Modern mobile telephone services use a cellular network architecture and therefore mobile telephones are called cellphones (or "cell phones") in North America. In addition to telephony, digital mobile phones support a variety of other services, such as text messaging, multimedia messaging, email, Internet access (via LTE, 5G NR, or Wi-Fi), short-range wireless communications (infrared, Bluetooth), satellite access (navigation, messaging connectivity), business applications, video games, and digital photography. Mobile phones offering only basic capabilities are known as feature phones; mobile phones which offer greatly advanced computing capabilities are referred to as smartphones.
The first handheld mobile phone was demonstrated
by Martin Cooper of Motorola in New York City on 3 April 1973, using a handset weighing
c. 2 kilograms (4.4 lbs). In 1979, Nippon Telegraph and Telephone (NTT) launched
the world's first cellular network in Japan.[3] In 1983, the DynaTAC 8000x was the first
commercially available handheld mobile phone. From 1983 to 2014, worldwide mobile
phone subscriptions grew to over seven billion; enough to provide one for every
person on Earth. In the first quarter of 2016, the top smartphone developers worldwide
were Samsung, Apple, and Huawei; smartphone sales represented 78 percent of total
mobile phone sales. For feature phones (slang: "dumbphones") as
of 2016, the top-selling brands were Samsung, Nokia, and Alcatel.
Mobile phones are considered an important
human invention as it has been one of the most widely used and sold pieces of consumer
technology. The growth in popularity has been rapid in some places, for example, in the UK the total number of mobile phones overtook the number of houses in 1999.
Today mobile phones are globally ubiquitous, and in almost half the world's countries,
over 90% of the population own at least one.
History
Martin Cooper of Motorola, shown here in a 2007 reenactment, made the first publicized handheld mobile phone call on a prototype DynaTAC model on 3 April 1973.
A handheld mobile radio telephone service
was envisioned in the early stages of radio engineering. In 1917, Finnish inventor
Eric Tigerstedt filed a patent for a "pocket-size folding telephone with a
very thin carbon microphone". Early predecessors of cellular phones included
analog radio communications from ships and trains. The race to create truly portable
telephone devices began after World War II, with developments taking place in many
countries. The advances in mobile telephony have been traced in successive "generations",
starting with the early zeroth-generation (0G) services, such as Bell System's Mobile
Telephone Service and its successor, the Improved Mobile Telephone Service. These
0G systems were not cellular, supported few simultaneous calls, and were very expensive.
The Motorola DynaTAC 8000X. In 1983, it became the first commercially available handheld cellular mobile phone.
The first handheld cellular mobile phone
was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using
a handset weighing 2 kilograms (4.4 lb). The first commercial automated cellular
network (1G) analog was launched in Japan by Nippon Telegraph and Telephone in 1979.
This was followed in 1981 by the simultaneous launch of the Nordic Mobile Telephone
(NMT) system in Denmark, Finland, Norway, and Sweden. Several other countries then
followed in the early to mid-1980s. These first-generation (1G) systems could support
far more simultaneous calls but still used analog cellular technology. In 1983,
the DynaTAC 8000x was the first commercially available handheld mobile phone.
In 1991, the second-generation (2G) digital
cellular technology was launched in Finland by Radiolinja on the GSM standard. This
sparked competition in the sector as the new operators challenged the incumbent
1G network operators. The GSM standard is a European initiative expressed at the
CEPT ("Conférence Européenne des Postes et Telecommunications", European
Postal and Telecommunications conference). The Franco-German R&D cooperation
demonstrated the technical feasibility, and in 1987 a Memorandum of Understanding
was signed between 13 European countries who agreed to launch a commercial service
by 1991. The first version of the GSM (=2G) standard had 6,000 pages. The IEEE and
RSE awarded Thomas Haug and Philippe Dupuis the 2018 James Clerk Maxwell medal
for their contributions to the first digital mobile telephone standard. In 2018,
the GSM was used by over 5 billion people in over 220 countries. The GSM (2G) has
evolved into 3G, 4G, and 5G. The standardization body for GSM started at the CEPT
Working Group GSM (Group Special Mobile) in 1982 under the umbrella of CEPT. In
1988, ETSI was established and all CEPT standardization activities were transferred
to ETSI. Working Group GSM became Technical Committee GSM. In 1991, it became Technical
Committee SMG (Special Mobile Group) when ETSI tasked the committee with UMTS (3G).
Dupuis and Haug during a GSM meeting in Belgium, April 1992
Personal Handy-phone System mobiles and modems, 1997–2003
In 2001, the third generation (3G) was
launched in Japan by NTT DoCoMo on the WCDMA standard. This was followed by 3.5G,
3G+, or turbo 3G enhancements based on the high-speed packet access (HSPA) family,
allowing UMTS networks to have higher data transfer speeds and capacity.
By 2009, it had become clear that, at some
point, 3G networks would be overwhelmed by the growth of bandwidth-intensive applications,
such as streaming media. Consequently, the industry began looking to data-optimized
fourth-generation technologies, with the promise of speed improvements up to ten-fold
over existing 3G technologies. The first two commercially available technologies
billed as 4G were the WiMAX standard, offered in North America by Sprint, and the
LTE standard, first offered in Scandinavia by TeliaSonera.
5G is a technology and term used in research
papers and projects to denote the next major phase in mobile telecommunication standards
beyond the 4G/IMT-Advanced standards. The term 5G is not officially used in any
specification or official document yet made public by telecommunication companies
or standardization bodies such as 3GPP, WiMAX Forum, or ITU-R. New standards beyond
4G are currently being developed by standardization bodies, but they are at this
time seen as under the 4G umbrella, not for a new mobile generation.
Types
Active mobile broadband subscriptions per 100 inhabitants.
Smartphone
Smartphones have a number of distinguishing
features. The International Telecommunication Union measures those with an Internet
connection, which it calls Active Mobile-Broadband subscriptions (which includes
tablets, etc.). In the developed world, smartphones have now overtaken the usage
of earlier mobile systems. However, in the developing world, they account for around
50% of mobile telephony.
Feature phone
Feature phone is a term typically used
as a retronym to describe mobile phones which are limited in capabilities in contrast
to a modern smartphone. Feature phones typically provide voice calling and text
messaging functionality, in addition to basic multimedia and Internet capabilities,
and other services offered by the user's wireless service provider. A feature phone
has additional functions over and above a basic mobile phone, which is only capable
of voice calling and text messaging. Feature phones and basic mobile phones tend
to use proprietary, custom-designed software and user interface. By contrast,
smartphones generally use a mobile operating system that often shares common traits
across devices.
Infrastructure
Cellular networks work by only reusing radio frequencies (in this example frequencies f1-f4) in nonadjacent cells to avoid interference
The critical advantage that modern cellular
networks have over predecessor systems is the concept of frequency reuse allowing
many simultaneous telephone conversations in a given service area. This allows efficient
use of the limited radio spectrum allocated to mobile services and lets thousands
of subscribers converse at the same time within a given geographic area.
Former systems would cover a service area
with one or two powerful base stations with a range of up to tens of kilometers
(miles), using only a few sets of radio channels (frequencies). Once these few channels
were in use by customers, no further customers could be served until another user
vacated a channel. It would be impractical to give every customer a unique channel
since there would not be enough bandwidth allocated to the mobile service. As well,
technical limitations such as antenna efficiency and receiver design limit the range
of frequencies a customer unit could use.
A cellular network mobile phone system
gets its name from dividing the service area into many small cells, each with a
base station with (for example) a useful range on the order of a kilometer (mile).
These systems have dozens or hundreds of possible channels allocated to them. When
a subscriber is using a given channel for a telephone connection, that frequency
is unavailable for other customers in the local cell and in the adjacent cells.
However, cells further away can re-use that channel without interference as the
subscriber's handset is too far away to be detected. The transmitter power of each
base station is coordinated to efficiently service its own cell, but not to interfere
with the cells further away.
Automation embedded in the customer's handset
and in the base stations controls all phases of the call, from detecting the presence
of a handset in a service area, temporary assignment of a channel to a handset making
a call, interface with the land-line side of the network to connect to other subscribers,
and collection of billing information for the service. The automation systems can
control the "hand-off" of a customer handset moving between one cell and
another so that call-in progress continues without interruption, changing channels
if required. In the earliest mobile phone systems, by contrast, all control was done
manually; the customer would search for an unoccupied channel and speak to a mobile
operator to request a connection of a call to a landline number or another mobile.
At the termination of the call, the mobile operator would manually record the billing
information.
Mobile phones communicate with cell towers
that are placed to give coverage across a telephone service area, which is divided
up into 'cells'. Each cell uses a different set of frequencies from neighboring
cells, and will typically be covered by three towers placed at different locations.
The cell towers are usually interconnected to each other and the phone network and
the internet by wired connections. Due to bandwidth limitations, each cell will have
a maximum number of cell phones it can handle at once. The cells are therefore sized
depending on the expected usage density and may be much smaller in cities. In that
case, much lower transmitter powers are used to avoid broadcasting beyond the cell.
In order to handle the high traffic, multiple
towers can be set up in the same area (using different frequencies). This can be
done permanently or temporarily such as at special events or in disasters. Cell
phone companies will bring a truck with equipment to host the abnormally high traffic.
Capacity was further increased when phone
companies implemented digital networks. With digital, one frequency can host multiple
simultaneous calls.
Additionally, short-range Wi-Fi infrastructure
is often used by smartphones as much as possible as it offloads traffic from cell
networks onto local area networks.
Software
Software platforms
Android smartphones
Feature phones have basic software platforms.
Smartphones have advanced software platforms. Android OS has been the best-selling
OS worldwide on smartphones since 2011.
Mobile app
A mobile app is a computer program designed
to run on a mobile device, such as a smartphone. The term "app" is a shortening
of the term "software application".
Messaging
A text message (SMS)
A common data application on mobile phones
is Short Message Service (SMS) text messaging. The first SMS message was sent from
a computer to a mobile phone in 1992 in the UK while the first person-to-person
SMS from phone to phone was sent in Finland in 1993. The first mobile news service,
delivered via SMS, was launched in Finland in 2000, and subsequently, many organizations
provided "on-demand" and "instant" news services by SMS. Multimedia
Messaging Service (MMS) was introduced in March 2002.
Application stores
The introduction of Apple's App Store for the iPhone and iPod Touch in July 2008 popularized manufacturer-hosted online distribution for third-party applications (software and computer programs) focused on a single platform. There are a huge variety of apps, including video games, music products, and business tools. Up until that point, smartphone application distribution depended on third-party sources providing applications for multiple platforms, such as GetJar, Handango, Handmark, and PocketGear. Following the success of the App Store, other smartphone manufacturers launched application stores, such as Google's Android Market (later renamed to the Google Play Store), RIM's BlackBerry App World, or Android-related app stores like Aptoide, Cafe Bazaar, F-Droid, GetJar, and Opera Mobile Store. In February 2014, 93% of mobile developers were targeting smartphones first for mobile app development.
Use
Mobile phone subscribers per 100 inhabitants. 2014 figure is estimated.
Mobile phones are used for a variety of
purposes, such as keeping in touch with family members, conducting business,
and in order to have access to a telephone in the event of an emergency. Some people
carry more than one mobile phone for different purposes, such as for business and
personal use. Multiple SIM cards may be used to take advantage of the benefits of
different calling plans. For example, a particular plan might provide cheaper
local calls, long-distance calls, international calls, or roaming.
The mobile phone has been used in a variety
of diverse contexts in society. For example:
- A study by Motorola found that one in ten mobile phone subscribers have a second phone that is often kept secret from other family members. These phones may be used to engage in such activities as extramarital affairs or clandestine business dealings.
- Some organizations assist victims of domestic violence by providing mobile phones for use in emergencies. These are often refurbished phones.
- The advent of widespread text messaging has resulted in the cell phone novel, the first literary genre to emerge from the cellular age, via text messaging to a website that collects the novels as a whole.
- Mobile telephony also facilitates activism and citizen journalism.
- The United Nations reported that mobile phones have spread faster than any other form of technology and can improve the livelihood of the poorest people in developing countries, by providing access to information in places where landlines or the Internet are not available, especially in the least developed countries. The use of mobile phones also spawns a wealth of micro-enterprises, by providing such work as selling airtime on the streets and repairing or refurbishing handsets.
- In Mali and other African countries, people used to travel from village to village to let friends and relatives know about weddings, births, and other events. This can now be avoided in areas with mobile phone coverage, which is usually more extensive than in areas with just landline penetration.
- The TV industry has recently started using mobile phones to drive live TV viewing through mobile apps, advertising, social TV, and mobile TV. It is estimated that 86% of Americans use their mobile phone while watching TV.
- In some parts of the world, mobile phone sharing is common. Cell phone sharing is prevalent in urban India, as families and groups of friends often share one or more mobile phones among their members. There are obvious economic benefits, but often familial customs and traditional gender roles play a part. It is common for a village to have access to only one mobile phone, perhaps owned by a teacher or missionary, which is available to all members of the village for necessary calls.
Content distribution
In 1998, one of the first examples of distributing
and selling media content through the mobile phone was the sale of ringtones by
Radiolinja in Finland. Soon afterward, other media content appeared, such as news,
video games, jokes, horoscopes, TV content, and advertising. The earliest content for
mobile phones tended to be copies of legacy media, such as banner advertisements
or TV news highlight video clips. Recently, unique content for mobile phones has
been emerging, from ringtones and ringback tones to mobisodes, video content that
has been produced exclusively for mobile phones.
Mobile banking and payment
Mobile payment system
In many countries, mobile phones are used
to provide mobile banking services, which may include the ability to transfer cash
payments by secure SMS text message. Kenya's M-PESA mobile banking service, for
example, allows customers of the mobile phone operator Safaricom to hold cash balances
which are recorded on their SIM cards. Cash can be deposited or withdrawn from M-PESA
accounts at Safaricom retail outlets located throughout the country and can be transferred
electronically from person to person and used to pay bills to companies.
Branchless banking has also been successful
in South Africa and the Philippines. A pilot project in Bali was launched in 2011
by the International Finance Corporation and an Indonesian bank, Bank Mandiri.
Mobile payments were first trialed in Finland
in 1998 when two Coca-Cola vending machines in Espoo were enabled to work with SMS
payments. Eventually, the idea spread and in 1999, the Philippines launched the
country's first commercial mobile payments systems with mobile operators Globe and
Smart.
Some mobile phones can make mobile payments
via direct mobile billing schemes, or through contactless payments if the phone
and the point-of-sale support near-field communication (NFC). Enabling contactless
payments through NFC-equipped mobile phones requires the cooperation of manufacturers,
network operators, and retail merchants.
Mobile tracking
Mobile phones are commonly used to collect
location data. While the phone is turned on, the geographical location of a mobile
phone can be determined easily (whether it is being used or not) using a technique
known as multiliterate to calculate the differences in time for a signal to travel
from the mobile phone to each of several cell towers near the owner of the phone.
The movements of mobile phone users can
be tracked by their service provider and, if desired, by law enforcement agencies
and their governments. Both the SIM card and the handset can be tracked.
China has proposed using this technology
to track the commuting patterns of Beijing city residents. In the UK and US, law
enforcement and intelligence services use mobile phones to perform surveillance
operations.
Hackers have been able to track a phone's
location, read messages, and record calls, by obtaining a subscriber’s phone
number.
While driving
A driver using two handheld mobile phones at once
A sign in the US restricting cell phone use to certain times of day (no cell phone use between 7:30-9:00 am and 2:00-4:15 pm)
Mobile phone use while driving, including
talking on the phone, texting, or operating other phone features, is common but
controversial. It is widely considered dangerous due to distracted driving. Being
distracted while operating a motor vehicle has been shown to increase the risk of
accidents. In September 2010, the US National Highway Traffic Safety Administration
(NHTSA) reported that 995 people were killed by drivers distracted by cell phones.
In March 2011, a US insurance company, State Farm Insurance, announced the results
of a study that showed 19% of drivers surveyed accessed the Internet on a smartphone
while driving. Many jurisdictions prohibit the use of mobile phones while driving.
In Egypt, Israel, Japan, Portugal, and Singapore, both handheld and hands-free use
of a mobile phone (which uses a speakerphone) is banned. In other countries, including
the UK and France, and in many US states, only handheld phone use is banned while
hands-free use is permitted.
A 2011 study reported that over 90% of
college students surveyed text (initiate, reply, or read) while driving. The scientific
literature on the dangers of driving while sending a text message from a mobile
phone, or texting while driving, is limited. A simulation study at the University
of Utah found a sixfold increase in distraction-related accidents when texting.
Due to the increasing complexity of mobile
phones, they are often more like mobile computers in their available uses. This
has introduced additional difficulties for law enforcement officials when attempting
to distinguish one usage from another in drivers using their devices. This is more
apparent in countries that ban both handheld and hands-free usage, rather than
those which ban handheld use only, as officials cannot easily tell which function
of the mobile phone is being used simply by looking at the driver. This can lead
to drivers being stopped for using their device illegally for a phone call when,
in fact, they were using the device legally, for example, when using the phone's
incorporated controls for car stereo, GPS, or satnav.
A 2010 study reviewed the incidence of
mobile phone use while cycling and its effects on behavior and safety. In 2013,
a national survey in the US reported the number of drivers who reported using their cell phones to access the Internet while driving had risen to nearly one in four.
A study conducted by the University of Vienna examined approaches for reducing inappropriate
and problematic use of mobile phones, such as using mobile phones while driving.
Accidents involving a driver being distracted
by talking on a mobile phone have begun to be prosecuted as negligence similar to
speeding. In the United Kingdom, from 27 February 2007, motorists who are caught
using a hand-held mobile phone while driving will have three penalty points added
to their license in addition to the fine of £60. This increase was introduced to
try to stem the increase in drivers ignoring the law. Japan prohibits all mobile
phone use while driving, including the use of hands-free devices. New Zealand has banned
hand-held cell phone use since 1 November 2009. Many states in the United States
have banned texting on cell phones while driving. Illinois became the 17th American
state to enforce this law. As of July 2010, 30 states had banned texting while driving,
with Kentucky becoming the most recent addition on 15 July.
Public Health Law Research maintains a
list of distracted driving laws in the United States. This database of laws provides
a comprehensive view of the provisions of laws that restrict the use of mobile communication
devices while driving for all 50 states and the District of Columbia between 1992
when the first law was passed, through 1 December 2010. The dataset contains information
on 22 dichotomous, continuous, or categorical variables including, for example, activities
regulated (e.g., texting versus talking, hands-free versus handheld), targeted populations,
and exemptions.
While walking
People using phones while walking
In 2010, an estimated 1500 pedestrians
were injured in the US while using a cellphone and some jurisdictions have attempted
to ban pedestrians from using their cellphones. Other countries, such as China and
the Netherlands, have introduced special lanes for smartphone users to help direct
and manage them.
Health effects
The effect of mobile phone radiation on
human health is the subject of recent interest and study, as a result of the enormous
increase in mobile phone usage throughout the world. Mobile phones use electromagnetic
radiation in the microwave range, which some believe may be harmful to human health.
A large body of research exists, both epidemiological and experimental, in non-human
animals and in humans. The majority of this research shows no definite causative
relationship between exposure to mobile phones and harmful biological effects in
humans. This is often paraphrased simply as the balance of evidence showing no harm
to humans from mobile phones, although a significant number of individual studies
do suggest such a relationship, or are inconclusive. Other digital wireless systems,
such as data communication networks, produce similar radiation.
On 31 May 2011, the World Health Organization
stated that mobile phone use may possibly represent a long-term health risk, classifying
mobile phone radiation as "possibly carcinogenic to humans" after a team
of scientists reviewed studies on mobile phone safety. The mobile phone is in category
2B, which ranks it alongside coffee and other possibly carcinogenic substances.
Some recent studies have found an association
between mobile phone use and certain kinds of brain and salivary gland tumors. Lennart
Har dell and other authors of a 2009 meta-analysis of 11 studies from peer-reviewed
journals concluded that cell phone usage for at least ten years "approximately
doubles the risk of being diagnosed with a brain tumor on the same ('ipsilateral')
side of the head as that preferred for cell phone use".
One study of past mobile phone use cited
in the report showed a "40% increased risk for gliomas (brain cancer) in the
highest category of heavy users (reported average: 30 minutes per day over a 10‐year period)". This is a reversal
of the study's prior position that cancer was unlikely to be caused by cellular
phones or their base stations and that reviews had found no convincing evidence
for other health effects. However, a study published 24 March 2012, in the British
Medical Journal questioned these estimates because the increase in brain cancers
has not paralleled the increase in mobile phone use. Certain countries, including
France, have warned against the use of mobile phones by minors in particular, due
to health risk uncertainties. Mobile pollution by transmitting electromagnetic waves
can be decreased by up to 90% by adopting the circuit as designed in mobile phones and
mobile exchanges.
In May 2016, preliminary findings of a
long-term study by the US government suggested that radio-frequency (RF) radiation,
the type emitted by cell phones, can cause cancer.
Theft
According to the Federal Communications
Commission, one out of three robberies involve the theft of a cellular phone. Police
data in San Francisco show that half of all robberies in 2012 were thefts of cellular
phones. An online petition on Change.org, called Secure our Smartphones,
urged smartphone manufacturers to install kill switches in their devices to make
them unusable if stolen. The petition is part of a joint effort by New York Attorney
General Eric Schneiderman and San Francisco District Attorney George Gascón and
was directed to the CEOs of the major smartphone manufacturers and telecommunication
carriers. On 10 June 2013, Apple announced that it would install a "kill switch"
on its next iPhone operating system, due to debut in October 2013.
All mobile phones have a unique identifier
called IMEI. Anyone can report their phone as lost or stolen with their Telecom
Carrier, and the IMEI would be blacklisted with a central registry. Telecom carriers,
depending upon local regulation can or must implement blocking of blacklisted phones
in their network. There are, however, a number of ways to circumvent a blacklist.
One method is to send the phone to a country where the telecom carriers are not
required to implement the blacklisting and sell it there, another involves altering
the phone's IMEI number. Even so, mobile phones typically have less value on the
second-hand market if the phone's original IMEI is blacklisted.
Culture and popularity
Mobile phones are considered an important
human invention as it has been one of the most widely used and sold pieces of consumer
technology. They have also become culturally symbolic. In Japanese mobile phone
culture, for example, mobile phones are often decorated with charms. They have also
become fashion symbols at times. The Motorola Razr V3 and LG Chocolate are two examples
of devices that were popular for being fashionable while not necessarily focusing
on the original purpose of mobile phones, i.e., a device to provide mobile telephony.
Some have also suggested that mobile phones
or smartphones are a status symbol. For example, a research paper suggested that
owning specifically an Apple iPhone was seen to be a status symbol.
Text messaging, which is performed on
mobile phones, has also led to the creation of 'SMS language'. It also led to the
growing popularity of emojis.
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