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5 paragraph essay about cell phones
A mobile essays about cell phonescellular phone, cell phonecellphonehandphoneor hand phonesometimes shortened to simply essays about cell phonescell or just phoneessays about cell phones, 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, essays about cell phones.
The radio frequency link establishes a essays about cell phones to the switching systems of a mobile phone operatorwhich provides access to the public switched telephone network PSTN. Modern mobile telephone services use a cellular network architecture and, therefore, mobile telephones are called cellular telephones or cell phones in North America. In addition to telephonydigital mobile phones 2G support a variety of other servicessuch as text messagingMMSessays about cell phones, emailInternet accessessays about cell phones, short-range wireless communications infraredBluetoothbusiness applications, video games and digital photography.
Mobile phones offering only those capabilities are known as feature phones ; mobile phones which offer greatly advanced computing capabilities are referred to as smartphones. The development of metal-oxide-semiconductor MOS large-scale integration LSI technology, information theory and cellular networking led to the development essays about cell phones affordable mobile communications.
Mitchell [2] [3] and Martin Cooper of Motorola inusing a handset weighing c. From toessays about cell phones, essays about cell phones mobile phone subscriptions grew to over seven billion; enough to provide one for every person on Earth. A handheld mobile radio telephone service was envisioned in the early stages of radio engineering. InFinnish 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 cellularsupported few simultaneous calls, and were very expensive. 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[1] and devices such as the car phone. The first handheld cellular mobile phone was demonstrated by John F.
Mitchell [2] [3] and Martin Cooper of Motorola inusing a handset weighing 2 kilograms 4. This was followed in by the simultaneous launch of the Nordic Mobile Telephone NMT system in Denmark, Finland, Norway, and Sweden. These first-generation 1G systems could support far more simultaneous calls but still used analog cellular technology. Inthe DynaTAC x was the first commercially available handheld mobile phone.
Digital cellular networks appeared in the s, enabled by the wide adoption of MOSFET -based RF power amplifiers power MOSFET and LDMOS and RF circuits RF CMOS[9] [10] [11] leading to the introduction of digital signal processing in wireless communications. 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", essays about cell phones, European Postal and Telecommunications conference.
The IEEE and RSE awarded to Thomas Haug and Philippe Dupuis the James Clerk Maxwell medal for their contributions to the first digital mobile telephone standard. The GSM 2G has evolved into 3G, 4G and 5G.
The standardisation body for GSM started at the CEPT Working Group GSM Group Special Mobile in under the umbrella of CEPT. InETSI was established and all CEPT standardization activities were transferred to ETSI. Working Group GSM became Technical Committee GSM. Init became Technical Committee SMG Special Mobile Group when ETSI tasked the Committee with UMTS 3G. The lithium-ion batteryan indispensable energy source for modern mobile phones, [13] was commercialized by Sony and Asahi Kasei in Byit had become clear that, at some point, 3G networks would be overwhelmed by the growth of bandwidth-intensive applications, such as streaming media.
The first two commercially available technologies billed as 4G were the WiMAX standard, offered in North America by Sprintand the LTE standard, first offered in Scandinavia by TeliaSonera. The term 5G is not officially used in any specification or official document yet made public by telecommunication companies or standardization bodies such as 3GPPWiMAX Forum or ITU-R, essays about cell phones.
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. Smartphones have a number of distinguishing features.
The International Telecommunication Union measures those with Internet connection, which essays about cell phones 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.
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. By contrast, smartphones generally use a mobile operating essays about cell phones that often shares common traits across devices. 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, essays about cell phones, 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 like at the Super Bowl, Taste of Chicago, State Fair, NYC New Year's Eve, hurricane hit cities, etc.
where cell phone companies will bring a truck with equipment to host the abnormally high traffic with a portable cell. Cellular can greatly increase the capacity of simultaneous wireless phone calls.
While a phone company for example, essays about cell phones, has a license to essays about cell phones, frequencies, each cell must use unique frequencies with each call using one of them when communicating.
Because cells only slightly overlap, the same frequency can be reused. Example cell one uses frequency 1—, next door cell uses frequency —1, next door can reuse frequency 1— This is even more greatly increased when phone companies implemented digital networks.
With digital, one frequency can host multiple simultaneous calls increasing capacity even more. As a phone moves around, a phone will "hand off" - automatically disconnect and reconnect to the tower of another cell 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 CPUssimilar 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 [21] 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. Depending on the device's type and design, the screen fills most or nearly all of the space on a device's front surface. Many smartphone displays have an aspect ratio ofbut taller aspect ratios became more common in Screen sizes are often measured in diagonal inches or millimeters ; feature phones generally have screen sizes below 90 millimetres 3.
Phones with screens larger than millimetres 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 essays about cell phones displays.
Liquid-crystal displays are the most common; others are IPSLEDOLEDessays about cell phones, and AMOLED displays. Some displays are integrated with pressure-sensitive digitizers, such as those developed by Wacom and Samsung[25] and Apple's " 3D Touch " system, essays about cell phones.
In sound, smartphones and feature phones vary little. Some audio-quality enhancing features, such as Voice over LTE and HD Voicehave 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, essays about cell phones.
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. Mobile phones require a small microchip called a Subscriber Identity Module or SIM cardin order to function. 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 securely stores the service-subscriber key IMSI and the K i used to identify and authenticate the user of the mobile phone. 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.
A hybrid mobile phone can hold up to four SIM cards, with a phone having a different device identifier for each SIM Card. SIM and R-UIM cards may be mixed together to allow both GSM and CDMA networks to be accessed. From onwards, such phones became popular in emerging markets, [32] and this was attributed to the desire to obtain the lowest calling costs. When the removal of a SIM card is detected by the operating system, it may deny further operation until a reboot.
Feature phones have basic software platforms. Smartphones have advanced software platforms. Android OS has been the best-selling OS worldwide on smartphones since 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". 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 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[34] and subsequently many organizations provided "on-demand" and "instant" news services by SMS.
Multimedia Messaging Service MMS was introduced in March The introduction of Apple's App Store for the iPhone and iPod Touch in July 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 gamesmusic products and business tools. Up until that point, smartphone application distribution depended on third-party sources providing applications for multiple platforms, essays about cell phones, such as GetJarHandangoHandmarkand 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 essays about cell phones, RIM's BlackBerry Essays about cell phones Worldessays about cell phones, or Android-related app stores like Aptoideessays about cell phones, Cafe BazaarF-DroidGetJarand Opera Mobile Store.
Advantages and Disadvantages of Mobile Phones Essay in English With Quotations - Essay Writing
, time: 11:18Essay on misuse of cell phones
1 day ago · The scarlet letter research paper, walden university library dissertations persuasive essay topics on social media dissertation mentor. How to write a novel title in an essay Customer relationship management case study topics on cell phones of Essay misuse phones on Essay misuse of cell dartmouth application essaysEssay normal font free what is the topic of essay Allowing students to use cell phones at school gives students the right to personal life and privacy. In addition, cell phones enhance research and improve students’ understanding since they have more access to information that is available on the Internet. More About Persuasive Essay Writing. What is the purpose of a persuasive essay? A mobile phone, cellular phone, cell phone, cellphone, handphone, or hand phone, sometimes shortened to simply mobile, cell or just phone, 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. The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which
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