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The International Telecommunication Union measures those with 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. 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.
A feature phone has additional functions over and above a basic mobile phone which is only capable of voice calling and text messaging.
By contrast, smartphones generally use a mobile operating system that often shares common traits across devices. There are Orthodox Jewish religious restrictions which, by some interpretations, standard mobile telephones overstep.
To deal with this problem, some rabbinical organizations have recommended that phones with text-messaging capability not be used by children.
Although these phones are intended to prevent immodesty , some vendors report good sales to adults who prefer the simplicity of the devices.
Some phones are approved for use by essential workers such as health, security, and public service workers on the sabbath , even though the use of any electrical device is generally prohibited during this time.
Each cell uses a different set of frequencies from neighbouring cells, and will typically be covered by 3 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. As a phone moves around, a phone will "hand off"- automatically disconnect and reconnect to the tower that gives the best reception.
Additionally, short-range Wi-Fi infrastructure is often used by smartphones as much as possible as it offloads traffic from cell networks on to local area networks.
Low-end mobile phones are often referred to as feature phones and offer basic telephony. Handsets with more advanced computing ability through the use of native software applications are known as smartphones.
Mobile phones have central processing units CPUs , similar to those in computers, but optimised to operate in low power environments. Mobile CPU performance depends not only on the clock rate generally given in multiples of hertz  but also the memory hierarchy also greatly affects overall performance.
Because of these problems, the performance of mobile phone CPUs is often more appropriately given by scores derived from various standardized tests to measure the real effective performance in commonly used applications.
One of the main characteristics of phones is the screen. Many smartphone displays have an aspect ratio of Screen sizes are measured in diagonal inches ; feature phones generally have screen sizes below 3.
Phones with screens larger than 5. Due to design advances, some modern smartphones with large screen sizes and "edge-to-edge" designs have compact builds that improve their ergonomics, while the shift to taller aspect ratios have resulted in phones that have larger screen sizes whilst maintaining the ergonomics associated with smaller In sound, smartphones and feature phones vary little.
Some audio-quality enhancing features, such as Voice over LTE and HD Voice , have appeared and are often available on newer smartphones.
Sound quality can remain a problem due to the design of the phone, the quality of the cellular network and compression algorithms used in long distance calls.
The small speakers can also be used to listen to digital audio files of music or speech or watch videos with an audio component, without holding the phone close to the ear.
The average phone battery lasts 2—3 years at best. Many of the wireless devices use a Lithium-Ion Li-Ion battery, which charges times, depending on how users take care of the battery and the charging techniques used.
Battery life can be extended by draining it regularly, not overcharging it, and keeping it away from heat. The SIM card is approximately the size of a small postage stamp and is usually placed underneath the battery in the rear of the unit.
The SIM card allows users to change phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone or broadband telephony device, provided that this is not prevented by a SIM lock.
From onwards, such phones became popular in emerging markets,  and this was attributed to the desire to obtain the lowest on-net calling rate.
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".
The first SMS message was sent from a computer to a mobile phone in in the UK while the first person-to-person SMS from phone to phone was sent in Finland in The first mobile news service, delivered via SMS, was launched in Finland in , [ citation needed ] and subsequently many organizations provided "on-demand" and "instant" news services by SMS.
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.
From to , Motorola was market leader in mobile phones. Nokia was the market leader in mobile phones from to Samsung has retained its top position since then.
In , the top five manufacturers worldwide were Samsung Mobile phones are used for a variety of purposes, such as keeping in touch with family members, for 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 for cheaper local calls, long-distance calls, international calls, or roaming. In , 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 afterwards, other media content appeared, such as news, video games, jokes, horoscopes, TV content and advertising. Most early 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.
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.
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. Another application of mobile banking technology is Zidisha , a US-based nonprofit micro-lending platform that allows residents of developing countries to raise small business loans from Web users worldwide.
Zidisha uses mobile banking for loan disbursements and repayments, transferring funds from lenders in the United States to borrowers in rural Africa who have mobile phones and can use the Internet.
Mobile payments were first trialled in Finland in when two Coca-Cola vending machines in Espoo were enabled to work with SMS payments. 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.
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 multilateration 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 a mobile phone user 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.
They possess technology that enables them to activate the microphones in mobile phones remotely in order to listen to conversations which take place near the phone.
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 March , a U. 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 U. 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 which 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.
A study reviewed the incidence of mobile phone use while cycling and its effects on behaviour and safety. Accidents involving a driver being distracted by talking on a mobile phone have begun to be prosecuted as negligence similar to speeding.
New Zealand has banned hand-held cell phone use since 1 November Many states in the United States have banned texting on cell phones while driving.
Illinois became the 17th American state to enforce this law. 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 when first law was passed, through 1 December The dataset contains information on 22 dichotomous, continuous or categorical variables including, for example, activities regulated e.
In , an estimated pedestrians were injured in the US while using a cellphone and some jurisdictions have attempted to ban pedestrians from using their cellphones.
The effect of mobile phone radiation on human health is the subject of recent [ when? 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 , 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.
Some recent [ when? In May , preliminary findings of a long-term study by the U. The average user replaces their mobile phone every 11 to 18 months,  and the discarded phones then contribute to electronic waste.
Mobile phone manufacturers within Europe are subject to the WEEE directive , and Australia has introduced a mobile phone recycling scheme.
According to the Federal Communications Commission , one out of three robberies involve the theft of a cellular phone. 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.
There are, however, a number of ways to circumvent a blacklist. Demand for metals used in mobile phones and other electronics fuelled the Second Congo War , which claimed almost 5.
The profits from the minerals finance the bloodiest conflict since the second world war; the war has lasted nearly 20 years and has recently flared up again.
For the last 15 years, the Democratic Republic of the Congo has been a major source of natural resources for the mobile phone industry.
From Wikipedia, the free encyclopedia. For the film, see Cell Phone film. For the film, see Handphone film. For the mobile personal computer, see Smartphone.
History of mobile phones. Cellular network and WiFi. This section needs expansion. You can help by adding to it. List of digital distribution platforms for mobile devices.
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